diff --git a/Shared/Extensions/CustomInterfaces/IAiPromptbausteinTreeExtension.cs b/Shared/Extensions/CustomInterfaces/IAiPromptbausteinTreeExtension.cs
index 3c974a990..ec7384aaa 100644
--- a/Shared/Extensions/CustomInterfaces/IAiPromptbausteinTreeExtension.cs
+++ b/Shared/Extensions/CustomInterfaces/IAiPromptbausteinTreeExtension.cs
@@ -27,10 +27,10 @@ namespace BS.Shared.Extensions.CustomInterfaces
 
 
 		public static bool IsPredefinedNode(this IAiPromptbaustein aiPromptbaustein)
-			=> aiPromptbaustein.isObject() && aiPromptbaustein.Oid < 0;
+			=> aiPromptbaustein.isObject() && aiPromptbaustein.Oid is long oid && oid < 0;
 
 		public static bool IsNoPredefinedNode(this IAiPromptbaustein aiPromptbaustein)
-			=> aiPromptbaustein.isObject() && aiPromptbaustein.Oid >= 0;
+			=> aiPromptbaustein.isObject() && (aiPromptbaustein.Oid is null || aiPromptbaustein.Oid >= 0);
 
 		public static bool IsAddablePredefinedNode(this IAiPromptbaustein aiPromptbaustein)
 			=> aiPromptbaustein.IsPredefinedNode() && !aiPromptbaustein.IsNoAddablePredefinedNode();