diff --git a/htdocs/core/db/mysqli.class.php b/htdocs/core/db/mysqli.class.php
index 6c3bfd2362f..1e244df883f 100644
--- a/htdocs/core/db/mysqli.class.php
+++ b/htdocs/core/db/mysqli.class.php
@@ -257,6 +257,7 @@ class DoliDBMysqli extends DoliDB
         $query = trim($query);
 
 	    if (! in_array($query, array('BEGIN','COMMIT','ROLLBACK'))) dol_syslog('sql='.$query, LOG_DEBUG);
+        if (empty($query)) return false;    // Return false = error if empty request
 
         if (! $this->database_name)
         {