diff --git a/src/main/java/server/maps/MapleMap.java b/src/main/java/server/maps/MapleMap.java
index 84e65eeae4..9bc18234f6 100644
--- a/src/main/java/server/maps/MapleMap.java
+++ b/src/main/java/server/maps/MapleMap.java
@@ -753,7 +753,7 @@ public class MapleMap {
             chRate = 1;
         }
 
-        final List<MonsterGlobalDropEntry> globalEntry = dropProvider.getRelevantGlobalDrops(this.getId());
+        final List<MonsterGlobalDropEntry> globalEntry = new ArrayList<>(dropProvider.getRelevantGlobalDrops(this.getId()));
 
         final List<MonsterDropEntry> dropEntry = new ArrayList<>();
         final List<MonsterDropEntry> visibleQuestEntry = new ArrayList<>();