[DevTools] Check location for null when creating EventListener

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

Index: third_party/WebKit/Source/devtools/front_end/sdk/DOMDebuggerModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/DOMDebuggerModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/DOMDebuggerModel.js
index fc3010b634042a52ef389a75ba106975a621cf42..6f7b4b85dc7e32499cc2c2dd7ee454c950c6576a 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/DOMDebuggerModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/DOMDebuggerModel.js
@@ -44,11 +44,13 @@ SDK.DOMDebuggerModel = class extends SDK.SDKModel {
     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;
   }