diff --git a/services/main.py b/services/main.py
index a25229c3f9391c64afca44ab250dd44aaac315ea..b3a0d9f253e97fe404724ce276e49b5c95eb43e9 100755
--- a/services/main.py
+++ b/services/main.py
@@ -340,7 +340,7 @@ def register():
 
                 # clear cache concerning this scholar
                     # TODO class User method !!
-                if uid in UCACHE: UCACHE.pop(uid)
+                if duuid in UCACHE: UCACHE.pop(duuid)
 
                 # E) end connection
                 reg_db.close()