How to debug: "TypeError: undefined is not an object (evaluating 't._leaflet_pos')" error


Every day I have 1 or more of these errors in my log:

Logger: frontend.js.latest.202105040
Source: components/system_log/ 
First occurred: 13:22:06 (1 occurrences) 
Last logged: 13:22:06 TypeError: undefined is not an object (evaluating 't._leaflet_pos')

It doesn’t seem to affect the functionality, but I would like to find out what is causing this, and if I can fix this. However, I’m nog sure where to look, or what to do to further investigate.
Has anybody some tips? Thanks!

I’m on Home-Assistant: 2021.5.1
Home Assistant OS 5.13
On an Intel-Nuc running ProxMox with the HASS OS image.

Has been reported a few times, but was never critical (no loss of functionality). Nonetheless, in the frontend dev branch, Bram has recently bumped the library version. That might solve it.

Ok, thanks for the update!
Will this then be fixed in the latest (core-2021.5.2) release?

No, this will most likely be part of 2021.6.