toolkit function ProDirectoryChoose error

Hello, I'm leaving a question because if I use the ProDirectoryChoose function while I was making the toolkit, I'm forced to exit.

The reason why this problem is difficult is that it is not always forced to shut down, but intermittently.

Does this function originally have this problem? Or am I using it incorrectly? I am attaching the code I wrote, so I would appreciate it if you let me know.

void OnIn_buttonClicked()
{
	ProError status = PRO_TK_NO_ERROR;

	//UI 디렉토리 대화상자 활성화
	status = ProDirectoryChoose(NULL, NULL, NULL, NULL, in_path);

	//UI input in_path 값 셋팅
	status = ProUIInputpanelValueSet(DIALOG_NAME2, "In_path", in_path);

	ProListDrwFilesInFolder();
}

The error occurs in ProDirectoryChoose.
in_path is a global variable of type ProPath.

Thank you.