[PHP 8.4] Warning: foreach() argument must be of type array|object, string given

[ADDISON74]

This is the error message

Warning: foreach() argument must be of type array|object, string given in /var/www/html/app/design/adminhtml/default/default/template/widget/grid.phtml on line 163

            <?php if ($_multipleRows = $this->getMultipleRows($_item)):?>
                <?php foreach ($_multipleRows as $_i):?> <= LINE 163
                <tr>
                    <?php $i=0;foreach ($this->getMultipleRowColumns($_i) as $_column): ?>
                        <td class="<?php echo $_column->getCssProperty() ?> <?php echo ++$i==$numColumns-1?'last':'' ?>">
                            <?php echo (($_html = $_column->getRowField($_i)) != '' ? $_html : '&nbsp;') ?>
                        </td>
                    <?php endforeach ?>
                </tr>
                <?php endforeach ?>
            <?php endif ?>

I am getting this error when running extension MageWorx SEO Suite Ultimate. Just accesss Backend > Catalog > SEO Breadcrumbs > Manage Breadcrumbs Priority for Category. Maybe other extensions could produce the same issue.

This must be solved using is_iterable() function

            <?php if ($_multipleRows = $this->getMultipleRows($_item)):?>
                <?php if (is_iterable($_multipleRows)): ?>
                    <?php foreach ($_multipleRows as $_i):?>
                <tr>
                    <?php $i=0;foreach ($this->getMultipleRowColumns($_i) as $_column): ?>
                        <td class="<?php echo $_column->getCssProperty() ?> <?php echo ++$i==$numColumns-1?'last':'' ?>">
                            <?php echo (($_html = $_column->getRowField($_i)) != '' ? $_html : '&nbsp;') ?>
                        </td>
                    <?php endforeach ?>
                </tr>
                <?php endforeach ?>
                <?php endif ?>