TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in array_key_exists()

Changes are made on on 11.x (our main development branch) first, and are then back ported as needed according to the Core change policies → .

In Drupal core we prefer that people add a comment stating they are working on an issue. See Assigning ownership of a Drupal core issue → for the details. Therefore, changing to 'unassigned'

@namisha jadhav, Please add steps to reproduce.