diff --git a/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py b/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py
index 4db68560a4..b544490cfb 100644
--- a/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py
+++ b/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDevice.py
@@ -124,11 +124,11 @@ class CloudOutputDevice(UltimakerNetworkedPrinterOutputDevice):
     def matchesNetworkKey(self, network_key: str) -> bool:
         # Typically, a network key looks like "ultimakersystem-aabbccdd0011._ultimaker._tcp.local."
         # the host name should then be "ultimakersystem-aabbccdd0011"
-        if network_key.startswith(str(self.clusterData.host_name)):
+        if network_key.startswith(str(self.clusterData.host_name or "")):
             return True
         # However, for manually added printers, the local IP address is used in lieu of a proper
         # network key, so check for that as well. It is in the format "manual:10.1.10.1".
-        if network_key.endswith(str(self.clusterData.host_internal_ip)):
+        if network_key.endswith(str(self.clusterData.host_internal_ip or "")):
             return True
         return False