I found the reason for the solution.

It turned out that the error is not random. An error occurs when adding a drop-down list to a static dialog box, after opening the dialog box, then clicking on the drop-down list and not clicking on the drop-down list item to close the dialog box, then upon reopening there will be an error when trying to open the drop-down list by clicking on it.

To solve the problem when calling the event of hiding the dialog box, call the hiding of the drop-down list element.



hide (el) {
el.hide ()
}