Sometimes apps on my Lumia 650 will crash when started. Restarting the phone does not help, neither is it a problem with installing it on the SD card etc. Most of the time a reinstall cycle will work, but this will wipe the app's data. Is there any other way to fix this?
Try a complete soft or a hard reset of the phone (that mostly helps here on my side, and these problems normally occur after an update like the Creators Update), but be sure to backup your files etc. before!
Navigate to the store page of said app, and click on "Launch" or "Install" from there. The app will then start normally.