Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Error is thrown only after adding a breakpoint in WebExtenstion debugger

  • 1 reply
  • 1 has this problem
  • 12 views
  • Last reply by Shadow110

deelydian
deelydian
more options

I'm not sure what has happened, but all of a sudden, the WebExtension I am working on started to throw an error when debugging. So far as I'm aware, there was no change to the code to cause the error, and I even rolled back to an earlier version of the extension in order to see if I had inadvertently caused a problem by adding something to the scripts I couldn't remember adding. The earlier version is no longer working correctly either.

Everything seems to be find until I add a breakpoint. After adding a breakpoint to the debugger in the FireFox Developer browser, an error is thrown, and I am unable to step through the code. Previously, I was able to set breakpoints and step through normally, but it will not work any longer. I've searched for answers online, but I'm not able to understand the error enough to gain any traction. Here is the error the console is writing:


error occurred while processing 'frames: TypeError: window is null Stack: webExtensionChildPrototype.isExtensionWindow@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/webextension.js:284:3 webExtensionChildPrototype._allowSource@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/webextension.js:304:13 TabSources/this.allowSource@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/utils/TabSources.js:30:39 source@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/utils/TabSources.js:118:12 createNonSourceMappedActor@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/utils/TabSources.js:357:12 getFrameLocation@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/utils/TabSources.js:587:7 form@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/frame.js:93:31 onFrames@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/thread.js:949:18 onPacket@resource://devtools/shared/base-loader.js -> resource://devtools/server/main.js:1761:15 receiveMessage@resource://devtools/shared/base-loader.js -> resource://devtools/shared/transport/transport.js:735:7 enter@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/utils/event-loop.js:118:5 _pushThreadPause@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/thread.js:178:5 _pauseAndRespond@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/thread.js:390:7 hit@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/breakpoint.js:188:12 appAPI.CallCrossDomain@moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/appapiclass.js:92:8 CheckLoginProcess@moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/popup.js:1434:4 FireLogin@moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/popup.js:1632:5 DrawLoginUI/<@moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/popup.js:181:6 dispatch@moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/jquery.js:5182:16 add/elemData.handle@moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/jquery.js:4991:6 Line: 284, column: 3 main.js:1616

_unknownError resource://devtools/server/main.js:1616:5 onPacket resource://devtools/server/main.js:1764:29 receiveMessage resource://devtools/shared/transport/transport.js:735:7 enter resource://devtools/server/actors/utils/event-loop.js:118:5 enter self-hosted:981:17 _pushThreadPause resource://devtools/server/actors/thread.js:178:5 _pauseAndRespond resource://devtools/server/actors/thread.js:390:7 next self-hosted:1219:9 hit resource://devtools/server/actors/breakpoint.js:188:12 appAPI.CallCrossDomain moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/appapiclass.js:92:8 CheckLoginProcess moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/popup.js:1434:4 FireLogin moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/popup.js:1632:5 DrawLoginUI/< moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/popup.js:181:6 dispatch moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/jquery.js:5182:16 add/elemData.handle moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/jquery.js:4991:6


I can provide code snippets if needed, but since the error is only thrown after I add the breakpoint, I don't know what code would be helpful for leading to a solution.

I'm hoping I have not missed something silly here, but I have searched for "window is null", "TypeError: window is null", "'frames: TypeError: windows is null" as well as other debugging searches in relation to jQuery and just can't find anything. Any help would be much appreciated.

I'm not sure what has happened, but all of a sudden, the WebExtension I am working on started to throw an error when debugging. So far as I'm aware, there was no change to the code to cause the error, and I even rolled back to an earlier version of the extension in order to see if I had inadvertently caused a problem by adding something to the scripts I couldn't remember adding. The earlier version is no longer working correctly either. Everything seems to be find until I add a breakpoint. After adding a breakpoint to the debugger in the FireFox Developer browser, an error is thrown, and I am unable to step through the code. Previously, I was able to set breakpoints and step through normally, but it will not work any longer. I've searched for answers online, but I'm not able to understand the error enough to gain any traction. Here is the error the console is writing: error occurred while processing 'frames: TypeError: window is null Stack: webExtensionChildPrototype.isExtensionWindow@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/webextension.js:284:3 webExtensionChildPrototype._allowSource@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/webextension.js:304:13 TabSources/this.allowSource@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/utils/TabSources.js:30:39 source@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/utils/TabSources.js:118:12 createNonSourceMappedActor@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/utils/TabSources.js:357:12 getFrameLocation@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/utils/TabSources.js:587:7 form@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/frame.js:93:31 onFrames@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/thread.js:949:18 onPacket@resource://devtools/shared/base-loader.js -> resource://devtools/server/main.js:1761:15 receiveMessage@resource://devtools/shared/base-loader.js -> resource://devtools/shared/transport/transport.js:735:7 enter@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/utils/event-loop.js:118:5 _pushThreadPause@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/thread.js:178:5 _pauseAndRespond@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/thread.js:390:7 hit@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/breakpoint.js:188:12 appAPI.CallCrossDomain@moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/appapiclass.js:92:8 CheckLoginProcess@moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/popup.js:1434:4 FireLogin@moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/popup.js:1632:5 DrawLoginUI/<@moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/popup.js:181:6 dispatch@moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/jquery.js:5182:16 add/elemData.handle@moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/jquery.js:4991:6 Line: 284, column: 3 main.js:1616 _unknownError resource://devtools/server/main.js:1616:5 onPacket resource://devtools/server/main.js:1764:29 receiveMessage resource://devtools/shared/transport/transport.js:735:7 enter resource://devtools/server/actors/utils/event-loop.js:118:5 enter self-hosted:981:17 _pushThreadPause resource://devtools/server/actors/thread.js:178:5 _pauseAndRespond resource://devtools/server/actors/thread.js:390:7 next self-hosted:1219:9 hit resource://devtools/server/actors/breakpoint.js:188:12 appAPI.CallCrossDomain moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/appapiclass.js:92:8 CheckLoginProcess moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/popup.js:1434:4 FireLogin moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/popup.js:1632:5 DrawLoginUI/< moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/popup.js:181:6 dispatch moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/jquery.js:5182:16 add/elemData.handle moz-extension://d059ac7f-1fe3-7649-b7ca-e14cb93b87b0/popup/scripts/jquery.js:4991:6 I can provide code snippets if needed, but since the error is only thrown after I add the breakpoint, I don't know what code would be helpful for leading to a solution. I'm hoping I have not missed something silly here, but I have searched for "window is null", "TypeError: window is null", "'frames: TypeError: windows is null" as well as other debugging searches in relation to jQuery and just can't find anything. Any help would be much appreciated.

All Replies (1)

Shadow110
Shadow110
more options

Hi, Am sorry this forum is for Firefox Desktop and Laptop Support. Please see the appropriate places for help in debugging and development as well to see if you are meeting the new standards :