Cant leave crew?

[Yulet_x 0]

Hello everyone, I just need one trophy to finish the game. That is the crew level 50 trophy all for one. 
 

I found out a quick way to achieve it just by joining crews who is already lvl 50. But the point is that I can not leave my own crew which I am the leader of. I do not see a option to the delete crew. 
 

Does someone else know what is going on? Because i think it will be a hell of a grind to get to level 50 just by earning reps.