When traveling from one planet to the other I get this error:
https://i.gyazo.com/b2261f66d4da909d9f57d9f0dc9be70c.jpg
funnily enough, the first time I wanted to screencap the error, it ended up like this:
https://i.gyazo.com/95d3564928e07eed7afc06d6e02d3e54.png

Hope it helps?

Thanks - I'll get on it tmrw

I am unable to create the original error on my end. I have put in a fix but am having a hard time testing. Any chance you could share your save?

The other option is to try out the latest version...
https://github.com/KzFactorios/TeleportFavorites/releases/tag/v0.0.93
Scroll down and download/install TeleportFavorites_0.0.93.zip to your mods dir.

I'll continue to troubleshoot and test, but in the meantime this may help you to play without the error.

My savefile has ~50 mods installed, if not more, so I'd rather test out your latest version. (.93).
Which seems to work, no more errors!
One odd thing: I need to go to the map view (m-key) and back before the top-left favorite menu is visible.

I can't get the "odd thing" to happen for me. I wonder if perhaps there is a conflict with another mod?
If you think of it - check out the factorio-current.log - there may be a clue in there.
Thanks for your response!

I did find this in the current.log:
78.709 Script @TeleportFavorites/core/utils/error_handler.lua:3: [TeleFaves] error_handler.lua loading...
78.710 Script @TeleportFavorites/core/utils/error_handler.lua:25: [TeleFaves] Auto-detecting debug path from: @TeleportFavorites/core/utils/error_handler.lua
78.710 Script @TeleportFavorites/core/utils/error_handler.lua:33: [TeleFaves] No debug path detected
78.716 Script @TeleportFavorites/core/utils/error_handler.lua:61: [TeleFaves] Initialize called with log_level: debug
78.716 Script @TeleportFavorites/core/utils/error_handler.lua:66: [TeleFaves] Logger initialized. Log level changed from 'production' to 'debug'
78.716 Script @TeleportFavorites/core/utils/error_handler.lua:68: [TeleFaves][DEBUG] Debug logging is ENABLED
78.723 Script @TeleportFavorites/control.lua:13: [TeleFaves][TEST] Test log entry from control.lua (should appear in factorio-current.log)
78.723 Script @TeleportFavorites/core/utils/error_handler.lua:61: [TeleFaves] Initialize called with log_level: production
78.723 Script @TeleportFavorites/core/utils/error_handler.lua:66: [TeleFaves] Logger initialized. Log level changed from 'debug' to 'production'
78.723 Checksum for script TeleportFavorites/control.lua: 3693353053

Does that help?

Yeah , this is just some garbledy-gook about log level and isn't indicating any error.
Are you still having issues with the fave bar showing up?