java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Editor$SelectionModifierCursorController.show()'

I have an exception on Crashlytics that doesn't show any of my code on the stack trace, how can I figure out what is causing it? Seems to be happening exclusively on Android 5.0 and 5.0.1. I am using the support library 23.4.

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Editor$SelectionModifierCursorController.show()' on a null object reference
       at android.widget.Editor$SelectionActionModeCallback.onCreateActionMode(Editor.java:3023)
       at com.android.internal.policy.impl.PhoneWindow$DecorView$ActionModeCallbackWrapper.onCreateActionMode(PhoneWindow.java:3163)
       at android.support.v7.view.SupportActionModeWrapper$CallbackWrapper.onCreateActionMode(SupportActionModeWrapper.java:155)
       at android.support.v7.app.AppCompatDelegateImplV7$ActionModeCallbackWrapperV7.onCreateActionMode(AppCompatDelegateImplV7.java:1742)
       at android.support.v7.app.AppCompatDelegateImplV7.startSupportActionModeFromWindow(AppCompatDelegateImplV7.java:802)
       at android.support.v7.app.AppCompatDelegateImplV7.startSupportActionMode(AppCompatDelegateImplV7.java:696)
       at android.support.v7.app.AppCompatDelegateImplV14$AppCompatWindowCallbackV14.startAsSupportActionMode(AppCompatDelegateImplV14.java:187)
       at android.support.v7.app.AppCompatDelegateImplV14$AppCompatWindowCallbackV14.onWindowStartingActionMode(AppCompatDelegateImplV14.java:171)
       at android.support.v7.view.WindowCallbackWrapper.onWindowStartingActionMode(WindowCallbackWrapper.java:145)
       at com.android.internal.policy.impl.PhoneWindow$DecorView.startActionMode(PhoneWindow.java:2644)
       at com.android.internal.policy.impl.PhoneWindow$DecorView.startActionModeForChild(PhoneWindow.java:2631)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:694)
       at android.view.View.startActionMode(View.java:4857)
       at android.widget.Editor.startSelectionActionMode(Editor.java:1626)
       at android.widget.Editor.performLongClick(Editor.java:914)
       at android.widget.TextView.performLongClick(TextView.java:8900)
       at android.view.View$CheckForLongPress.run(View.java:19735)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5253)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

EDIT1: A user who reported the crash figured out how to reproduce it. It happens when he uses my AppCompatAutoCompleteTextView to select all the text and copy it to the clipboard. It only happens on Android 5.0 and 5.0.1

EDIT2: I think it is happening on more than just Android 5 but the stacktrace looks different enough that Crashlytics doesn't group it. Based on some posts I found I think it has to do with the Contextual Actionbar height or how it calculates it but I haven't found a clear answer yet.