This is a low priority. I recently installed shotcut on Ubuntu 16.04. AFAICT, video import, editing and export works without any problems, unlike a similar error message.
When I run
shotcut -v from the command line I get:
shotcut -v QStandardPaths: XDG_RUNTIME_DIR points to non-existing path '/run/user/1000/snap.shotcut', please create it with 0700 permissions. Shotcut 19.09.14
My desktop environment is gnome, I installed shotcut via AppImage.
I am not sure if I should create the folder, or ignore the message at this point.