diff --git a/edlclient/Library/Modules/oneplus.py b/edlclient/Library/Modules/oneplus.py
index 52c3438..9367f47 100755
--- a/edlclient/Library/Modules/oneplus.py
+++ b/edlclient/Library/Modules/oneplus.py
@@ -204,6 +204,7 @@ def convert_projid(self, fh, projid, serial):
                 else:
                     assert "Device is not supported"
                     exit(0)
+        assert "Unknown projid:"+str(projid)
         return None
 
     def run(self):