diff --git a/src/app/editor/character-editor/inventory-slot-editor/inventory-slot-characteristic-editor/inventory-slot-characteristic-editor.component.ts b/src/app/editor/character-editor/inventory-slot-editor/inventory-slot-characteristic-editor/inventory-slot-characteristic-editor.component.ts
index d0d3c1a..0d21b41 100644
--- a/src/app/editor/character-editor/inventory-slot-editor/inventory-slot-characteristic-editor/inventory-slot-characteristic-editor.component.ts
+++ b/src/app/editor/character-editor/inventory-slot-editor/inventory-slot-characteristic-editor/inventory-slot-characteristic-editor.component.ts
@@ -29,7 +29,11 @@ export class InventorySlotCharacteristicEditorComponent implements OnInit{
 
   ngOnInit() {
     this.itemgroups.forEach(itemgroup => {
-      this.availableCharacteristics = this.availableCharacteristics.concat(itemgroup.itemGroupCharacteristics);
+      itemgroup.itemGroupCharacteristics.forEach(characteristic => {
+        if(!this.availableCharacteristics.includes(characteristic)) {
+          this.availableCharacteristics.push(characteristic)
+        }
+      })
     })
     this.datasource.data = this.inventorySlot!.slotCharacteristics;
   }