NullPointerExceptionAttempt on checkPermission

[thuan09878]

Fatal Exception: java.lang.NullPointerExceptionAttempt to invoke virtual method 'int android.content.Context.checkPermission(java.lang.String, int, int)' on a null object reference

  | android.support.v4.content.ContextCompat.checkSelfPermission (ContextCompat.java:439)
  | agency.tango.materialintroscreen.SlideFragment.hasPermissionsToGrant (SlideFragment.java:154)
  | agency.tango.materialintroscreen.SlideFragment.hasAnyPermissionsToGrant (SlideFragment.java:95)
  | agency.tango.materialintroscreen.listeners.MessageButtonBehaviourOnPageSelected.pageSelected (MessageButtonBehaviourOnPageSelected.java:30)
  | agency.tango.materialintroscreen.MaterialIntroActivity$1.run (MaterialIntroActivity.java:113)
  | android.os.Handler.handleCallback (Handler.java:739)
  | com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1120)

I don't know where in my code cause this problem, this is the message i got from fabric.
Can you tell me how to fix this?

[Adsama94]

I faced this same issue. The fix for this is explained here - https://stackoverflow.com/questions/37322645/nullpointerexception-when-trying-to-check-permissions