diff --git a/WotBlitzStatisticsPro.Common/Model/AccountInfoResponse.cs b/WotBlitzStatisticsPro.Common/Model/AccountInfoResponse.cs
index dea75a5..9e2bc48 100644
--- a/WotBlitzStatisticsPro.Common/Model/AccountInfoResponse.cs
+++ b/WotBlitzStatisticsPro.Common/Model/AccountInfoResponse.cs
@@ -16,17 +16,17 @@ namespace WotBlitzStatisticsPro.Common.Model
         ///<summary>
         /// Account creation date
         ///</summary>
-        public DateTime CreatedAt { get; set; }
+        public DateTime CreatedAt { get; set; } = new DateTime(1970, 1, 1);
 
         ///<summary>
         /// Last battle time
         ///</summary>
-        public DateTime LastBattleTime { get; set; }
+        public DateTime LastBattleTime { get; set; } = new DateTime(1970, 1, 1);
 
-        ///<summary>
-        /// Player's nick
-        ///</summary>
-        public string? Nickname { get; set; }
+		///<summary>
+		/// Player's nick
+		///</summary>
+		public string? Nickname { get; set; }
 
 		///<summary>
 		/// Battles count
diff --git a/WotBlitzStatisticsPro.Logic/Dictionaries/DictionariesUpdaterResolver.cs b/WotBlitzStatisticsPro.Logic/Dictionaries/DictionariesUpdaterResolver.cs
index 70d3db1..1da037d 100644
--- a/WotBlitzStatisticsPro.Logic/Dictionaries/DictionariesUpdaterResolver.cs
+++ b/WotBlitzStatisticsPro.Logic/Dictionaries/DictionariesUpdaterResolver.cs
@@ -7,6 +7,6 @@ namespace WotBlitzStatisticsPro.Logic.Dictionaries
     /// </summary>
     /// <param name="dictionaryType">Dictionary type for resolving service.</param>
     /// <returns>Updater service.</returns>
-    public delegate IDictionaryUpdater DictionariesUpdaterResolver(DictionaryType dictionaryType);
+    public delegate IDictionaryUpdater? DictionariesUpdaterResolver(DictionaryType dictionaryType);
 
 }
\ No newline at end of file
diff --git a/WotBlitzStatisticsPro.Logic/Mappers/VehicleDictionaryProfile.cs b/WotBlitzStatisticsPro.Logic/Mappers/VehicleDictionaryProfile.cs
index 83bddd1..49be930 100644
--- a/WotBlitzStatisticsPro.Logic/Mappers/VehicleDictionaryProfile.cs
+++ b/WotBlitzStatisticsPro.Logic/Mappers/VehicleDictionaryProfile.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using AutoMapper;
 using WotBlitzStatisticsPro.Common.Dictionaries;
 using WotBlitzStatisticsPro.DataAccess.Model;
@@ -26,9 +27,9 @@ namespace WotBlitzStatisticsPro.Logic.Mappers
                 .ForMember(d => d.NormalImage,
                     o => o.MapFrom(s => s.Images == null ? string.Empty : s.Images["normal"]))
                 .ForMember(d => d.PriceCredit,
-                    o => o.MapFrom(s => s.Cost == null ? string.Empty : s.Cost["price_credit"]))
+                    o => o.MapFrom(s => s.Cost == null ? decimal.Zero : Convert.ToDecimal(s.Cost["price_credit"])))
                 .ForMember(d => d.PriceGold,
-                    o => o.MapFrom(s => s.Cost == null ? string.Empty : s.Cost["price_gold"]))
+                    o => o.MapFrom(s => s.Cost == null ? decimal.Zero : Convert.ToDecimal(s.Cost["price_gold"])))
                 .ForMember(d => d.NexTanksInTree,
                     o =>
                         o.MapFrom(s => s.NextTanks))
diff --git a/WotBlitzStatisticsPro.Logic/WargamingAccounts.cs b/WotBlitzStatisticsPro.Logic/WargamingAccounts.cs
index 4a07688..74c1efd 100644
--- a/WotBlitzStatisticsPro.Logic/WargamingAccounts.cs
+++ b/WotBlitzStatisticsPro.Logic/WargamingAccounts.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 using WotBlitzStatisticsPro.Common.Model;
 using WotBlitzStatisticsPro.Logic.AccountInformationPipeline;
 using WotBlitzStatisticsPro.Logic.AccountInformationPipeline.OperationContext;
@@ -11,31 +12,45 @@ namespace WotBlitzStatisticsPro.Logic
     public class WargamingAccounts: IWargamingAccounts
     {
         private readonly IOperationFactory _operationFactory;
+        private readonly ILogger<WargamingAccounts> _logger;
 
-        public WargamingAccounts(IOperationFactory operationFactory)
+        public WargamingAccounts(IOperationFactory operationFactory, ILogger<WargamingAccounts> logger)
         {
             _operationFactory = operationFactory;
+            _logger = logger;
         }
 
-        public async Task<AccountInfoResponse> GatherAccountInformation(RealmType realm, long accountId, RequestLanguage requestLanguage)
+        public async Task<AccountInfoResponse> GatherAccountInformation(RealmType realm, long accountId,
+            RequestLanguage requestLanguage)
         {
             var contextData = new AccountInformationPipelineContextData();
-            var context = new OperationContext(new AccountRequest(accountId, realm, requestLanguage));
-            context.AddOrReplace(contextData);
-            var pipeline = new Pipeline<IOperationContext>(_operationFactory);
-
-            pipeline.AddOperation<GetAccountInfoOperation>()
-                .AddOperation<GetTanksInfoOperation>()
-                .AddOperation<CalculateStatisticsOperation>()
-                .AddOperation<BuildAccountInfoResponseOperation>()
-                ;
-
-            var firstOperation = pipeline.Build();
-            if (firstOperation != null)
+            try
             {
-                await firstOperation
-                    .Invoke(context, null)
-                    .ConfigureAwait(false);
+
+                var context = new OperationContext(new AccountRequest(accountId, realm, requestLanguage));
+                context.AddOrReplace(contextData);
+                var pipeline = new Pipeline<IOperationContext>(_operationFactory);
+
+                pipeline.AddOperation<GetAccountInfoOperation>()
+                    .AddOperation<GetTanksInfoOperation>()
+                    .AddOperation<CalculateStatisticsOperation>()
+                    .AddOperation<BuildAccountInfoResponseOperation>()
+                    ;
+
+                var firstOperation = pipeline.Build();
+                if (firstOperation != null)
+                {
+                    await firstOperation
+                        .Invoke(context, null)
+                        .ConfigureAwait(false);
+                }
+
+            }
+            catch (Exception e)
+            {
+                _logger.LogError(e, "GatherAccountInformation error");
+
+                throw;
             }
 
             return contextData?.Response ?? new AccountInfoResponse();
@@ -44,55 +59,71 @@ namespace WotBlitzStatisticsPro.Logic
         public async Task<AccountInfoResponse> GatherAndSaveAccountInformation(RealmType realm, long accountId, RequestLanguage requestLanguage)
         {
             var contextData = new AccountInformationPipelineContextData();
-            var context = new OperationContext(new AccountRequest(accountId, realm, requestLanguage));
-            context.AddOrReplace(contextData);
-            var pipeline = new Pipeline<IOperationContext>(_operationFactory);
-
-            pipeline.AddOperation<GetAccountInfoOperation>()
-                .AddOperation<ReadAccountInfoFromDbOperation>()
-                .AddOperation<CheckLastBattleDateOperation>()
-                .AddOperation<GetTanksInfoOperation>()
-                .AddOperation<CalculateStatisticsOperation>()
-                .AddOperation<SaveAccountAndTanksOperation>()
-                .AddOperation<BuildAccountInfoResponseOperation>()
-                ;
-
-            var firstOperation = pipeline.Build();
-            if (firstOperation != null)
+            try
             {
-                await firstOperation
-                    .Invoke(context, null)
-                    .ConfigureAwait(false);
-            }
 
+                var context = new OperationContext(new AccountRequest(accountId, realm, requestLanguage));
+                context.AddOrReplace(contextData);
+                var pipeline = new Pipeline<IOperationContext>(_operationFactory);
+
+                pipeline.AddOperation<GetAccountInfoOperation>()
+                    .AddOperation<ReadAccountInfoFromDbOperation>()
+                    .AddOperation<CheckLastBattleDateOperation>()
+                    .AddOperation<GetTanksInfoOperation>()
+                    .AddOperation<CalculateStatisticsOperation>()
+                    .AddOperation<SaveAccountAndTanksOperation>()
+                    .AddOperation<BuildAccountInfoResponseOperation>()
+                    ;
+
+                var firstOperation = pipeline.Build();
+                if (firstOperation != null)
+                {
+                    await firstOperation
+                        .Invoke(context, null)
+                        .ConfigureAwait(false);
+                }
+            }
+            catch (Exception e)
+            {
+                _logger.LogError(e, "GatherAndSaveAccountInformation error");
+
+                throw;
+            }
             return contextData?.Response ?? new AccountInfoResponse();
         }
 
         public async Task<AccountInfoHistoryResponse> GetAccountInfoHistory(RealmType realm, long accountId, DateTime startDate, RequestLanguage requestLanguage)
         {
             var contextData = new AccountHistoryInformationPipelineContextData(startDate);
-            var context = new OperationContext(new AccountRequest(accountId, realm, requestLanguage));
-            context.AddOrReplace(contextData);
-            var pipeline = new Pipeline<IOperationContext>(_operationFactory);
-
-            pipeline.AddOperation<ReadAccountInfoFromDbOperation>()
-                .AddOperation<ReadAccountInfoHistoryFromDbOperation>()
-                .AddOperation<CheckIfHistoryIsEmptyOperation>()
-                .AddOperation<FillOverallStatisticsOperation>()
-                .AddOperation<FillPeriodStatisticsOperation>()
-                .AddOperation<FillPeriodDifferenceOperation>()
-                .AddOperation<FillStatisticsDifferenceOperation>()
-                .AddOperation<FillAccountInfoHistoryResponse>()
-                ;
-
-            var firstOperation = pipeline.Build();
-            if (firstOperation != null)
+            try
             {
-                await firstOperation
-                    .Invoke(context, null)
-                    .ConfigureAwait(false);
-            }
+                var context = new OperationContext(new AccountRequest(accountId, realm, requestLanguage));
+                context.AddOrReplace(contextData);
+                var pipeline = new Pipeline<IOperationContext>(_operationFactory);
 
+                pipeline.AddOperation<ReadAccountInfoFromDbOperation>()
+                    .AddOperation<ReadAccountInfoHistoryFromDbOperation>()
+                    .AddOperation<CheckIfHistoryIsEmptyOperation>()
+                    .AddOperation<FillOverallStatisticsOperation>()
+                    .AddOperation<FillPeriodStatisticsOperation>()
+                    .AddOperation<FillPeriodDifferenceOperation>()
+                    .AddOperation<FillStatisticsDifferenceOperation>()
+                    .AddOperation<FillAccountInfoHistoryResponse>()
+                    ;
+
+                var firstOperation = pipeline.Build();
+                if (firstOperation != null)
+                {
+                    await firstOperation
+                        .Invoke(context, null)
+                        .ConfigureAwait(false);
+                }
+            }
+            catch (Exception e)
+            {
+                _logger.LogError(e, "GetAccountInfoHistory error");
+                throw;
+            }
             return contextData?.Response ?? new AccountInfoHistoryResponse();
         }
     }
diff --git a/WotBlitzStatisticsPro.Logic/WargamingDictionaries.cs b/WotBlitzStatisticsPro.Logic/WargamingDictionaries.cs
index 2d2548a..585a6c9 100644
--- a/WotBlitzStatisticsPro.Logic/WargamingDictionaries.cs
+++ b/WotBlitzStatisticsPro.Logic/WargamingDictionaries.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 using WotBlitzStatisticsPro.Common.Model;
 using WotBlitzStatisticsPro.Logic.Dictionaries;
 
@@ -9,27 +10,37 @@ namespace WotBlitzStatisticsPro.Logic
     public class WargamingDictionaries: IWargamingDictionaries
     {
         private readonly DictionariesUpdaterResolver _dictionaryUpdaterFactoryMethod;
+        private readonly ILogger<WargamingDictionaries> _logger;
 
-        public WargamingDictionaries(DictionariesUpdaterResolver dictionaryUpdaterFactoryMethod)
+        public WargamingDictionaries(DictionariesUpdaterResolver dictionaryUpdaterFactoryMethod, ILogger<WargamingDictionaries> logger)
         {
             _dictionaryUpdaterFactoryMethod = dictionaryUpdaterFactoryMethod;
+            _logger = logger;
         }
         
         public async Task<UpdateDictionariesResponseItem[]> UpdateDictionaries(UpdateDictionariesRequest updateDictionariesRequest)
         {
             var response = new List<UpdateDictionariesResponseItem>();
 
-            foreach (var dictionaryType in (DictionaryType[])Enum.GetValues(typeof(DictionaryType)))
+            try
             {
-                if ((updateDictionariesRequest.DictionaryTypes & dictionaryType) != 0)
+                foreach (var dictionaryType in (DictionaryType[]) Enum.GetValues(typeof(DictionaryType)))
                 {
-                    var dictionaryUpdater = _dictionaryUpdaterFactoryMethod(dictionaryType);
-                    if (dictionaryUpdater != null)
+                    if ((updateDictionariesRequest.DictionaryTypes & dictionaryType) != 0)
                     {
-                        response.Add(await dictionaryUpdater.Update());
+                        var dictionaryUpdater = _dictionaryUpdaterFactoryMethod(dictionaryType);
+                        if (dictionaryUpdater != null)
+                        {
+                            response.Add(await dictionaryUpdater.Update());
+                        }
                     }
                 }
             }
+            catch (Exception e)
+            {
+                _logger.LogError(e, "UpdateDictionaries error");
+                throw;
+            }
 
             return response.ToArray();
         }
diff --git a/WotBlitzStatisticsPro.Logic/WotBlitzStatisticsLogicInstaller.cs b/WotBlitzStatisticsPro.Logic/WotBlitzStatisticsLogicInstaller.cs
index 148aa45..db5ac71 100644
--- a/WotBlitzStatisticsPro.Logic/WotBlitzStatisticsLogicInstaller.cs
+++ b/WotBlitzStatisticsPro.Logic/WotBlitzStatisticsLogicInstaller.cs
@@ -49,7 +49,7 @@ namespace WotBlitzStatisticsPro.Logic
                     DictionaryType.StaticDictionaries => serviceProvider.GetService<StaticDictionariesUpdater>()!,
                     DictionaryType.Achievements => serviceProvider.GetService<AchievementsDictionaryUpdater>()!,
                     DictionaryType.Vehicles => serviceProvider.GetService<VehiclesDictionaryUpdater>()!,
-                    _ => throw new ApplicationException($"Unknown dictionary type '{dictionaryType}'")
+                    _ => null
                 };
             });
         }
diff --git a/WotBlitzStatisticsPro.Tests/DictionariesTests/DictionariesServiceTests.cs b/WotBlitzStatisticsPro.Tests/DictionariesTests/DictionariesServiceTests.cs
index e42cd09..03d02d8 100644
--- a/WotBlitzStatisticsPro.Tests/DictionariesTests/DictionariesServiceTests.cs
+++ b/WotBlitzStatisticsPro.Tests/DictionariesTests/DictionariesServiceTests.cs
@@ -1,5 +1,6 @@
 using System.Threading.Tasks;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
 using Moq;
 using NUnit.Framework;
 using WotBlitzStatisticsPro.Common.Model;
@@ -40,7 +41,8 @@ namespace WotBlitzStatisticsPro.Tests.DictionariesTests
 
             var services = serviceProvider.BuildServiceProvider();
 
-            _wargamingDictionaries = new WargamingDictionaries(services.GetService<DictionariesUpdaterResolver>());
+            _wargamingDictionaries = new WargamingDictionaries(services.GetService<DictionariesUpdaterResolver>(),
+                (new Mock<ILogger<WargamingDictionaries>>()).Object);
         }
 
         [Test]