Firefox bug on UI Builder

We have a UIBuilder page that is working normally on all Chrome-based browsers but not on Firefox.

Specifically, on Firefox we are getting this error Uncaught (in promise) TypeError: sourceList is undefined




App ID: 4A47197B-AE30-FA84-FF56-0071F4010900
Link to replicate

Seems like it is IANA timezones not supported by Firefox. Will switch to UTC timezones and see if that works

We switched to IANA timezones and stil have the issue. Might there be a bug in the Backendless convert to locale date block?



Have you checked what’s going on here:

1 Like

@mark-piller we have identified where the issue is caused but cannot solve it.

At the point you specifiy on the page, we have a custom function that has a number as an input, called selectedWeek.


We have added logs everywhere. While on other browsers, the selectedWeek flows nicely into the custom function

In firefox, it has no value

This causes an error "Cannot read properties of undefined (reading '0')"

Any suggestions?

Could you please create a separate page with one demo function that demonstrates the issue?

Yes I will do that and revert.

Found the issue. Some of the timezone conversion features did not work on old mobile phones, specifically Safari with iOs version 12. We recreated that piece of code on the backend and it works.