diff --git a/src/engine/objects/ItemTemplate.java b/src/engine/objects/ItemTemplate.java
index 84bbdb33..580e0b52 100644
--- a/src/engine/objects/ItemTemplate.java
+++ b/src/engine/objects/ItemTemplate.java
@@ -496,10 +496,14 @@ public class ItemTemplate {
                 rune_fx_txt = (String) jsonObject.get("rune_fx_txt");
 
                 int group_tactics_bitvector = ((Long) jsonObject.get("rune_group_tactics")).intValue();
-                rune_group_tactics.addAll(Enum.fromLong(group_tactics_bitvector, Enum.MobBehaviourType.class));
+
+                if (group_tactics_bitvector != 0)
+                    rune_group_tactics.addAll(Enum.fromLong(group_tactics_bitvector, Enum.MobBehaviourType.class));
 
                 int group_role_bitvector = ((Long) jsonObject.get("rune_group_role_set")).intValue();
-                rune_group_role_set.addAll(Enum.fromLong(group_role_bitvector, Enum.MobBehaviourType.class));
+
+                if (group_role_bitvector != 0)
+                    rune_group_role_set.addAll(Enum.fromLong(group_role_bitvector, Enum.MobBehaviourType.class));
 
                 JSONArray enemy_types_json = (JSONArray) jsonObject.get("rune_enemy_monster_types");