Without the full log.txt it's hard to diagnose a crash. It could be caused by add ons, settings ,etc.
Move the preferences folder (found in the Output folder) to the desktop, then restart X‑Plane and default preferences will be restored. If the default preferences do not fix your problem, you can simply replace them with the folder you moved to the desktop and restore your personalized settings.
Try moving the Custom Scenery folder and plugins folders (found in the Resources folder) to the desktop, then restart X-Plane.