Error in log every minute

I get this error in my log every minute or so, anyone know what it is or how I can get more info?

https://mydomain.duckdns.org/frontend_latest/app-17305af0f25247ad302620ff87b7a617.js:2:31128 TypeError: undefined is not an object (evaluating 't.length')

got the same, managed to solve it?
It occurred to me after some changes in the lovelace file.

see CustomUI - discussion thread

getting the same error, and had related ones before, having to do with the custom-ui, and caching issues. This time its not cache related (cleared all and rebooted all systems after updating to 075.1 both hassio and hassos. Hassos showing the error now.

replying to myself for reference;-)
occurring when language is set to certain languages, in my case Dutch.Switching to English solves the error.
Hassos 0.75.3