NullPointerException when safePopTo

[JoyHong]

java.lang.NullPointerException:
at android.view.ViewGroup.removeViewInternal (ViewGroup.java:5300)
at android.view.ViewGroup.removeViewAt (ViewGroup.java:5263)
at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState (FragmentManager.java:1446)
at androidx.fragment.app.FragmentManager.moveToState (FragmentManager.java:1497)
at androidx.fragment.app.BackStackRecord.executeOps (BackStackRecord.java:447)
at androidx.fragment.app.FragmentManager.executeOps (FragmentManager.java:2169)
at androidx.fragment.app.FragmentManager.executeOpsTogether (FragmentManager.java:1992)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute (FragmentManager.java:1947)
at androidx.fragment.app.FragmentManager.execPendingActions (FragmentManager.java:1849)
at androidx.fragment.app.FragmentManager.popBackStackImmediate (FragmentManager.java:641)
at androidx.fragment.app.FragmentManager.popBackStackImmediate (FragmentManager.java:596)
at me.yokeyword.fragmentation.TransactionDelegate.safePopTo (TransactionDelegate.java:503)
at me.yokeyword.fragmentation.TransactionDelegate.access$800 (TransactionDelegate.java:34)
at me.yokeyword.fragmentation.TransactionDelegate$5.run (TransactionDelegate.java:232)
at me.yokeyword.fragmentation.queue.ActionQueue.handleAction (ActionQueue.java:58)
at me.yokeyword.fragmentation.queue.ActionQueue.enqueueAction (ActionQueue.java:46)
at me.yokeyword.fragmentation.queue.ActionQueue.access$000 (ActionQueue.java:17)
at me.yokeyword.fragmentation.queue.ActionQueue$1.run (ActionQueue.java:37)
at android.os.Handler.handleCallback (Handler.java:790)
at android.os.Handler.dispatchMessage (Handler.java:99)
at android.os.Looper.loop (Looper.java:164)
at android.app.ActivityThread.main (ActivityThread.java:6548)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:857)

[aa86799]

fragment may be null ?