Can not perform this action after onSaveInstanceState

Stack trace

java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
	at android.support.v4.app.FragmentManagerImpl.checkStateLoss(SourceFile:1493)
	at android.support.v4.app.FragmentManagerImpl.enqueueAction(SourceFile:1511)
	at android.support.v4.app.BackStackRecord.commitInternal(SourceFile:634)
	at android.support.v4.app.BackStackRecord.commit(SourceFile:613)
	at com.my.package.ui.activities.LoginActivity.onRegisterClicked(SourceFile:94)
	at com.my.package.ui.fragments.LoginFragment1$1.onClick(SourceFile:114)
	at android.view.View.performClick(View.java:4278)
	at android.view.View$PerformClick.run(View.java:17430)
	at android.os.Handler.handleCallback(Handler.java:725)
	at android.os.Handler.dispatchMessage(Handler.java:92)
	at android.os.Looper.loop(Looper.java:213)
	at android.app.ActivityThread.main(ActivityThread.java:5092)
	at java.lang.reflect.Method.invokeNative(Method.java)
	at java.lang.reflect.Method.invoke(Method.java:511)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)
	at dalvik.system.NativeStart.main(NativeStart.java)