If a triggered element on the node edit form is anything other than "#submit," the above error will occur.
When a paragraph is added inside a node using a paragraph reference field, and inside the manage form display the mode is changed to modal form in the widget settings, the above error occurs.
There should be a check for this:
if (!$triggering_element || !in_array('::save', $triggering_element['#submit'])) {
return;
}to
if (!$triggering_element || (isset($triggering_element['#submit']) && !in_array('::save', $triggering_element['#submit']))) {
return;
}Closed: duplicate
1.0
Code
Closing this as it is duplicate of " 397358 - Menu link submit save callback detection breaks some AJAX forms 🐛 3218969 breaks some AJAX forms Active "