[Crash-iOS]app crashed while using TWTRComposer to compse a tweet

[FrogTan1986]

• iOS version 10.3.1

• twitter kit version:1.15.3 or 2.8.1

• there is no twitter account in system configuration
  *my code is like this:

    TWTRComposer *composer = [[TWTRComposer alloc] init];
    [composer setText:@"text"l];
    [composer setImage:image];
    [composer setURL:url];
    [composer showFromViewController:fromViewController
                                            completion:completion];
  

• the crash info is:

    Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present a nil modal view controller on target....