[DevTools] Check location for null when creating EventListener

third_party/WebKit/Source/devtools/front_end/sdk/DOMDebuggerModel.js

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 SDK.DOMDebuggerModel = class extends SDK.SDKModel {
   /**
    * @param {!SDK.Target} target
    */
   constructor(target) {
     super(target);
@@ skipping 26 matching lines @@
     if (!remoteObject.objectId)
       return [];
 
     var payloads = await this._agent.getEventListeners(
         /** @type {string} */ (remoteObject.objectId), undefined, undefined,
         (error, payloads) => error ? [] : payloads);
     var eventListeners = [];
     for (var payload of payloads) {
       var location = this._runtimeModel.debuggerModel().createRawLocationByScriptId(
           payload.scriptId, payload.lineNumber, payload.columnNumber);
+      if (!location)
+        continue;
       eventListeners.push(new SDK.EventListener(
           this, remoteObject, payload.type, payload.useCapture, payload.passive, payload.once,
           payload.handler ? this._runtimeModel.createRemoteObject(payload.handler) : null,
-          payload.originalHandler ? this._runtimeModel.createRemoteObject(payload.originalHandler) : null,
-          /** @type {!SDK.DebuggerModel.Location} */ (location), null));
+          payload.originalHandler ? this._runtimeModel.createRemoteObject(payload.originalHandler) : null, location,
+          null));
     }
     return eventListeners;
   }
 
   retrieveDOMBreakpoints() {
     this._domModel.requestDocument();
   }
 
   /**
    * @return {!Array<!SDK.DOMDebuggerModel.DOMBreakpoint>}
@@ skipping 773 matching lines @@
   /**
    * @override
    * @param {!SDK.DOMDebuggerModel} domDebuggerModel
    */
   modelRemoved(domDebuggerModel) {
   }
 };
 
 /** @type {!SDK.DOMDebuggerManager} */
 SDK.domDebuggerManager;