In short: is TS3Functions::requestInfoUpdate thread safe?

What makes me doubt is, if I call it from a callback function, which seems to be running on the GUI thread, everything works fine, but when i do the same from a background thread, I get a crash:

Exception thrown at 0x00007FFEC3252881 (Qt5Gui.dll) in ts3client_win64.exe: 0xC0000005: Access violation reading location 0x0000000000000008.

The callstack shows(see attached image), that something in the QT widgets / GUI dll crashed, which makes it suspicious. Then again, I could be wrong, and maybe I made an error, but I'd like to know for sure, that i'm not chasing a ghost.

So, is requestInfoUpdate() thread-safe, as it is stated in the docs?

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Kind regards,