I've been experiencing Avenue crashing immediately upon startup this morning (Avenue 7.4.1 76771, MacOS Mojave 10.14.6).
The only thing that has changed on my system since it booted fine was a bunch of old VST audio plug-ins that I installed yesterday (to extract some work from an old project). On a hunch, I cleared out my VST plug-ins folder and Avenue now successfully boots once again.
This might be worth a try for other users experiencing similar problems. Now, time to binary chop these plug-ins to try and isolate the culprit.