Closing app
Why does one of my apps keep crashing and closing? I can’t get my Twitter app to open but my other apps seem to work.
iPhone XS
If the issue is related to that app only, your iPhone should be okay.
Have you already tried to delete that app, then redownload/reinstall it again?
If the issue still persists, contact the manufacturer's support team and ask them.
Regards
Giulio