pythonnet
diff --git a/‎src/runtime/TypeManager.cs‎
Lines changed: 1 addition & 1 deletion b/‎src/runtime/TypeManager.cs‎
Lines changed: 1 addition & 1 deletion
@@ -171,7 +171,7 @@ public static int tp_setattro_dlr_proxy(BorrowedReference ob, BorrowedReference
                 // Try DLR member storage first
                 bool handled = false;
 
-                if (val == null)
+                if (val.IsNull)
                 {
                     handled = dynamicMemberAccessor.TryDeleteMember(dynamicObject, memberName);
                 }
Original file line number	Diff line number	Diff line change
@@ -171,7 +171,7 @@ public static int tp_setattro_dlr_proxy(BorrowedReference ob, BorrowedReference
171	171	// Try DLR member storage first
172	172	bool handled = false;
173	173
174		- if (val == null)
	174	+ if (val.IsNull)
175	175	{
176	176	handled = dynamicMemberAccessor.TryDeleteMember(dynamicObject, memberName);
177	177	}