diff --git a/analyze_wotb_replays.py b/analyze_wotb_replays.py
index 04f71c1..72fffa2 100755
--- a/analyze_wotb_replays.py
+++ b/analyze_wotb_replays.py
@@ -511,10 +511,13 @@ class BattleCategorization():
 
 
 	def get_filter_categories(self, filters: list) -> list:
-		if type(filters) != list:
-			filters = [ filters ]
-		return [ x for x in filters if x in self.get_categories() ]
-
+		try:
+			if type(filters) != list:
+				filters = [ filters ]
+			return [ x for x in filters if x in self.get_categories() ]
+		except Exception as err:
+			bu.error('Category: ' + str(self.category_key), exception=err)
+		return None
 
 	def help(self): 
 		"""Help"""
@@ -733,7 +736,10 @@ class BattleStringCategorization(BattleCategorization):
 
 	def get_filter_categories(self, filters: list) -> list:
 		try:
-			return filters
+			if type(filters) != list:
+				filters = [ filters ]
+			return [ x for x in filters if x in self.get_categories() ]
+			# return filters
 		except Exception as err:
 			bu.error('Category: ' + str(self.category_key), exception=err)
 		return None
@@ -769,11 +775,14 @@ class BattleNumberCategorization(BattleCategorization):
 
 	def get_filter_categories(self, filters: list) -> list:
 		try:
+			if type(filters) != list:
+				filters = [ filters ]
 			return list(map(str,filters))
 		except Exception as err:
 			bu.error('Category: ' + str(self.category_key), exception=err)
 		return None
 
+
 	def help(self):
 		super().help()
 		print('INTEGER')
@@ -1477,7 +1486,7 @@ async def main(argv):
 		parser.add_argument('--replays', action='store_true', default=False, help='Export replay info in JSON format')
 		parser.add_argument('-o','--outfile', type=str, default='-', metavar="OUTPUT", help='File to write results. Default STDOUT')
 		parser.add_argument('--db', action='store_true', default=OPT_DB, help='Use DB - You are unlikely to have it')
-		parser.add_argument('--filters', type=str, default=None, help='Filter replays based on categories. Filters given in JSON format.\nUse array "[]" for multiple filters/values. see --mode help.\nExample: : [ {"tier" : [8,9,10] }, { "player_wins" : 5 }]')
+		parser.add_argument('--filters', type=str, default=None, help='Filter replays based on categories. Filters given in JSON format.\nUse array "[]" for multiple filters/values. see --mode help.\nExample: : [ {"tank_tier" : [8,9,10] }, { "player_wins" : 5 }]')
 		parser.add_argument('--filters_db', type=str, default=None, help='[only for DB setup] Filter replays in DB based on categories. Filters given in MongoDB JSON format. See --mode help')
 		parser.add_argument('--min', type=int, default=None, help='Only select replays from players with minimum number of replays in the dataset')
 		parser.add_argument('-d', '--debug', action='store_true', default=False, help='Debug mode')
@@ -1841,6 +1850,7 @@ def filter_results(results: list, filter_json : str) -> bool:
 		for category in filter_cats:
 			cat = category.category_key
 			categorization = filter_cats.get_categorization(cat)
+			bu.debug('Category: ' + cat + ' filters type: ' + str(type(filters)) + ' filters: ' + str(filters))
 			filters[cat] = categorization.get_filter_categories(filters[cat])
 			bu.verbose('  ' + cat + ' = ' + ','.join(filters[cat]))		
 		bu.verbose('')