NullPointerException after edit fab click

[kitfist0]

java.lang.NullPointerException: transitionName must not be null
    at my.cardholder.util.ViewExtKt.setupUniqueTransitionName(ViewExt.kt:7)
    at my.cardholder.ui.card.editor.CardEditorFragment.initViews(CardEditorFragment.kt:40)
    at my.cardholder.ui.base.BaseFragment.onViewCreated(BaseFragment.kt:67)
    at androidx.fragment.app.Fragment.performViewCreated(Fragment.java:3128)
    at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:552)
    at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:261)
    at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1890)
    at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1814)
    at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1751)
    at androidx.fragment.app.FragmentManager$5.run(FragmentManager.java:538)
    at android.os.Handler.handleCallback(Handler.java:942)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loopOnce(Looper.java:201)
    at android.os.Looper.loop(Looper.java:288)
    at android.app.ActivityThread.main(ActivityThread.java:7898)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)