[SOLVED] Intermittent blank screen after moving to 4.3


We are getting intermittent blank screens when going to mattermost URL, which goes away after the 4th refresh, sometimes more.

Steps to reproduce

We are getting the problem after upgrading from 3.8 to 4.3

Observed behavior

When we get the blank screen we get the following error in the browser console:

Uncaught (in promise) TypeError: Cannot read property 'substring' of undefined
    at t.value (team_button.jsx:55)
    at d._renderValidatedComponentWithoutOwnerOrContext (ReactCompositeComponent.js:802)
    at d._renderValidatedComponent (ReactCompositeComponent.js:825)
    at d.performInitialMount (ReactCompositeComponent.js:365)
    at d.mountComponent (ReactCompositeComponent.js:261)
    at Object.mountComponent (ReactReconciler.js:49)
    at mountChildren (ReactMultiChild.js:240)
    at m._createInitialChildren (ReactDOMComponent.js:707)
    at mountComponent (ReactDOMComponent.js:526)
    at Object.mountComponent (ReactReconciler.js:49)

Hi @aga_sumit,

Thank you for your feedback,

Could you share whether this is on browser, desktop app or mobile? If browser or mobile, which one?

Also, does this reproduce when you just navigate to the URL or after you’ve inserted your log-in credentials?

If you can provide more detailed repro steps, we can try to reproduce on our end.


Hi @lindy65,

This is happening for me on all platforms Chrome browser, desktop app and we use Citrix Secure Web on the mobile.
This problem happens after login.
I believe we may have a similar problem to another thread which had something about entries present on channelmembers for a team that was previously deleted by manual database manipulation.
I am going to ask our database admin to run some queries to check this.


We deleted the orphan channels using the following and it seems to be working now:

platform channel delete {channels}

Thanks for posting back your solution @aga_sumit :slight_smile:

Glad things are working for you again!