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Attempt to invoke virtual method 'void android.opengl.GLSurfaceView$GLThread.onPause()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.opengl.GLSurfaceView$GLThread.onPause()' on a null object reference	at android.opengl.GLSurfaceView.onPause(GLSurfaceView.java:551)	at com.canre.displaysimulation.MainActivity.updateContents(MainActivity.java:112)	at com.canre.displaysimulation.MainActivity.updatePresentation(MainActivity.java:104)	at com.canre.displaysimulation.MainActivity.onResume(MainActivity.java:47)	at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1258)	at android.app.Activity.performResume(Activity.java:6312)	at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3092)