Add isset check

WordPress · Oct 20, 2022 · 7c1c7f7 · 7c1c7f7
1 parent 1b6afb8
commit 7c1c7f7
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php
@@ -297,7 +297,7 @@ public function prepare_item_for_response( $item, $request ) {
 					$field = $block_type->$extra_field;
 					if ( in_array( $extra_field, $deprecated_fields, true ) && is_array( $field ) ) {
 						// Since the schema only allows strings or null (but no arrays), we return the first array item.
-						$field = $field[0];
+						$field = isset( $field[0] ) ? $field[0] : null;
 					}
 				} elseif ( array_key_exists( 'default', $schema['properties'][ $extra_field ] ) ) {
 					$field = $schema['properties'][ $extra_field ]['default'];