diff --git a/htdocs/lib/mysql.lib.php b/htdocs/lib/mysql.lib.php
index 72e4046a8ef..5dfa2a6b598 100644
--- a/htdocs/lib/mysql.lib.php
+++ b/htdocs/lib/mysql.lib.php
@@ -115,6 +115,10 @@ class DoliDb {
       {
 	return $this->query("BEGIN");
       }
+    else
+      {
+	return 1;
+      }
   }
 
   Function commit($do=1)
@@ -123,6 +127,10 @@ class DoliDb {
       {
 	return $this->query("COMMIT");
       }
+    else
+      {
+	return 1;
+      }
   }
 
   Function rollback($do=1)
@@ -131,6 +139,10 @@ class DoliDb {
       {
 	return $this->query("ROLLBACK");
       }
+    else
+      {
+	return 1;
+      }
   }
 
   Function query($query, $limit="", $offset="")