diff --git a/db_qbe.php b/db_qbe.php
index 65a13c055..aa3ad3e7d 100644
--- a/db_qbe.php
+++ b/db_qbe.php
@@ -815,7 +815,8 @@ if (isset($Field) && count($Field) > 0) {
             }
         } // end if (exactly one where clause)
 
-        unset($tab_all[$master]);
+        $tab_left = $tab_all;
+        unset($tab_left[$master]);
         $tab_know[$master] = $master;
 
         $run   = 0;