Merge branch 'sprint/182_hufangzhou_18673' into 'master'

* Fix bug #18673.

See merge request easycorp/zentaopms!1483

module/bug/control.php

@@ -599,7 +599,7 @@ class bug extends control
         /* Get executions. */
         $executions = array(0 => '');
         if(isset($projects[$projectID]) or $this->config->systemMode == 'classic') $executions += $this->product->getExecutionPairsByProduct($productID, $branch ? "0,$branch" : 0, 'id_desc', $projectID);
-        $execution  = $executionID ? $this->execution->getByID($executionID) : '';
+        $execution  = $executionID ? $this->loadModel('execution')->getByID($executionID) : '';
         $executions = isset($executions[$executionID]) ? $executions : $executions + array($executionID => $execution->name);
 
         /* Set custom. */