diff --git a/backend-flask/InterfaceSetup.py b/backend-flask/InterfaceSetup.py
index e437398..cebd02c 100644
--- a/backend-flask/InterfaceSetup.py
+++ b/backend-flask/InterfaceSetup.py
@@ -74,7 +74,7 @@ def asset_already_existing(self, assetId):
     def descriptor_already_exist(self, descriptors, assetId):
         descriptor = {}
         for _descriptor in descriptors:
-            if assetId == _descriptor["globalAssetId"]:
+            if assetId == _descriptor.get("globalAssetId", ""):
                 return _descriptor
         return descriptor
             
@@ -281,4 +281,4 @@ def push_payload_to_submodelElement(self, submodel, name, payload):
                 return submodel
         
         return submodel
-    
\ No newline at end of file
+