diff --git a/htdocs/lib/mysql.lib.php b/htdocs/lib/mysql.lib.php
index 4a70a5cbaab..8c9e282566d 100644
--- a/htdocs/lib/mysql.lib.php
+++ b/htdocs/lib/mysql.lib.php
@@ -507,7 +507,8 @@ class DoliDb
             if (isset($this->errorcode_map[mysql_errno($this->db)])) {
                 return $this->errorcode_map[mysql_errno($this->db)];
             }
-            return 'DB_ERROR_'.mysql_errno($this->db);
+            $errno=mysql_errno($this->db);
+            return ($errno?'DB_ERROR_'.$errno:'0');
         }
     }
 
diff --git a/htdocs/lib/pgsql.lib.php b/htdocs/lib/pgsql.lib.php
index 4c673c7a224..716b087ff25 100644
--- a/htdocs/lib/pgsql.lib.php
+++ b/htdocs/lib/pgsql.lib.php
@@ -503,7 +503,8 @@ class DoliDb
                 return $code;
             }
         }
-        return 'DB_ERROR';
+        $errno=pg_last_error($this->db);
+        return ($errno?'DB_ERROR':'0');
     }
     
     /**