Go to Help > Show Log in Finder/Explorer -> idea
File-> Settings -> Tools -> Tabnine:
- Set Log File Path <some path to a file>
- (optional) Set log level to "debug"
- Restart the IDE
Another option is:
Open: Help -> Edit Custom Properties...
and insert: TABNINE_LOG_FILE_PATH=<some path to a file>
Then restart IDE and wait for the problem to happen.