Crash when selecting a table row

Problem/Motivation

When selecting an entry from a table, VBO crashes with:

TypeError: undefined is not an object (evaluating '$summary[0].textContent=Drupal.formatPlural(data.count,'Selected 1 item','Selected @count items')')

from line 4173 in

 success(data) {
                    selectionObject.totalCount = data.count;
                    $selectionInfo.html(data.selection_info);
                    $summary[0].textContent = Drupal.formatPlural(data.count, 'Selected 1 item', 'Selected @count items');
                    selectionObject.toggleButtonsState();
                    selectionObject.ajaxing = false;
 }

I think the issue is $summary is not an array.

This code is updating the number of selected items, and because of the fault the remainder of the code does not execute, including enabling the Apply button.

Setting 'Show an "Items selected" details element' to 'Always hide' stops the issue, presumably because the selected count is not updated.

Unfortunately I don't know when this was introduced - we are using v4.4.5, but the view hasn't been used for some time, so it could have been introduced in a previous version.

Steps to reproduce

Using a table view and VBO, select a row in the table, or select all. The Apply button is not enabled, and the error is seen in the console.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes