Fix #1042

Author: Eremel

src/game_object.lua

@@ -2994,7 +2994,7 @@ Set `prefix_config.key = false` on your object instead.]]):format(obj.key), obj.
             end
         end,
         apply = function(self, card, val)
-            if not val then
+            if not val and card.ability[self.key] then
                 if card.ability[self.key].card_limit then card.ability.card_limit = card.ability.card_limit - card.ability[self.key].card_limit end
                 if card.ability[self.key].extra_slots_used then card.ability.extra_slots_used = card.ability.extra_slots_used - card.ability[self.key].extra_slots_used end
             end

version.lua

@@ -1 +1 @@
-return "1.0.0~BETA-1028a-STEAMODDED"
+return "1.0.0~BETA-1028b-STEAMODDED"