VCPreviewView is crash

[IOSDeveloperProgrammer]

@jgh- Hi, The broadcast VCpreviewView is crashed, when i was try to connect broad cast in sometimes not a all.
crash at class VCpreviewView.mm in
Method: - (void) setupGLES method i
LINE: [EAGLContext setCurrentContext:current];
why its goes to wrong in sometimes ?i could not find out this issue still. please tell me