After the app was closed, dialogfragment can’t to attach to activity. mHome = null.
While the first start the app, dialog worked normal, but when i want to close the app, then start it again, i get error:

java.lang.IllegalStateException: FragmentManager has been destroyed
                                                                                                        at androidx.fragment.app.FragmentManager.enqueueAction(FragmentManager.java:1635)
                                                                                                        at androidx.fragment.app.BackStackRecord.commitInternal(BackStackRecord.java:341)
                                                                                                        at androidx.fragment.app.BackStackRecord.commit(BackStackRecord.java:306)
                                                                                                        at androidx.fragment.app.DialogFragment.show(DialogFragment.java:262)
                                                                                                        at tc.android.exchange.ExchangeActivity.MessageSend(ExchangeActivity.java:942)                                                                                                   

After some hours of debug, i understand that fragment can’t attach to activity. Another threads can’t help me.

Creating the DialogFragment:

public void MessageSend()
    {
        outgoingMessageDialog = new OutgoingMessageDialog(this);
        outgoingMessageDialog.Setup(SelectedContact);
        getSupportFragmentManager().beginTransaction().commitAllowingStateLoss();
            outgoingMessageDialog.show(getSupportFragmentManager(),  "");
    }

The DialogFragment class:

@Override
    public void onCreate(Bundle savedInstanceState) {
       // savedInstanceState = null;
        super.onCreate(savedInstanceState);
        setStyle(STYLE_NORMAL, R.style.CommonDialogTheme);

    }
    @Override
    public void onDestroy() {
        super.onDestroy();

    }
    @Override
    public void onDismiss(final DialogInterface dialog) {
        super.onDismiss(dialog);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        v = inflater.inflate(R.layout.outgoing_message_dialog, container, false);
        DialogTitle = v.findViewById(R.id.dialog_title_view);
        Send = v.findViewById(R.id.send_message_layout);
        InputLayout = v.findViewById(R.id.input_message_layout);
        Send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Client.SendTextMessage(InputLayout.getEditText().getText().toString());
                dismiss();

            }
        });
        getDialog().setCanceledOnTouchOutside(true);
        getDialog().setOnCancelListener(
                new DialogInterface.OnCancelListener() {
                    @Override
                    public void onCancel(DialogInterface dialog) {
                      dismiss();
                    }
                }
        );
        Window window = getDialog().getWindow();
        window.setGravity(Gravity.CENTER_VERTICAL|Gravity.CENTER);
        Bind();
        return v;
    }

    public void Setup(ContactModel Contact)
    {
        this.Contact = Contact;
        Bind();
    }

    int min = 0;
    int sec = 0;

    private void Bind()
    {
        if(v == null) return;
        if(Contact == null) return;

    }

What am I doing something wrong here; is this behaviour to be expected?