Ticket #26106: 26106.2.diff

wp-includes/wp-db.php

@@ -1785 +1785 @@
                         $wheres[] = "`$field` = {$form}";
                 }
 
-                $sql = "UPDATE `$table` SET " . implode( ', ', $bits ) . ' WHERE ' . implode( ' AND ', $wheres );
+                $wheres = empty ( $where ) ? '1 = 1' : implode( ' AND ', $wheres );
+
+                $sql = "UPDATE `$table` SET " . implode( ', ', $bits ) . ' WHERE ' . $wheres;
                 return $this->query( $this->prepare( $sql, array_merge( array_values( $data ), array_values( $where ) ) ) );
         }