How to debug: Uncaught TypeError: dmxRouting.js:7 Cannot read property '0' of null

Wappler General Need Help
1

Hi all,

Getting this error:

Uncaught TypeError: dmxRouting.js:7
Cannot read property '0' of null
    at n.update (dmxRouting.js:7)
    at n.$update (dmxAppConnect.js:7)
    at dmxAppConnect.js:7
    at Array.forEach (<anonymous>)
    at n.$update (dmxAppConnect.js:7)
    at dmxAppConnect.js:7
    at Array.forEach (<anonymous>)
    at n.$update (dmxAppConnect.js:7)
    at dmxAppConnect.js:7
    at dmxAppConnect.js:7

This is happening in a few pages - and I believe is the root cause of some data not displaying unless I scroll - then it renders.

Can anyone point me towards how I would debug something like this, so I can find and fix the issue?

2

This could mean the error is coming from a repeat.
Are you able to see a file name and line number on the extreme left of the console error message (Other than dmxRouting.js:7)? That might give you more insight on AppConnect code where the error message is originating from.
Also, this is NodeJS I assume?

3

Hey @sid thanks for helping.

I’m not sure where I would see a file name and line number, this is a screen of the error:

Screen Shot 2020-11-05 at 5.44.17 pm

Is there another area of dev tools I can look at to find such?

Yep, NodeJS :slight_smile:

4

Sorry, I mean right extreme. In you case, its dmxRounting.js:7. Sometimes, it points to anoth VM file. Forgot what its called.
You could try removing parts on the page to at least identify which code block is giving out this error.

5

ah ok , got it - unfortunately not, nothing relating to a page / column :frowning:

I’ll see if I can find the cultprit doing what you suggest. Thank you