Added extra check for the existance of the function name with callbacks. Some themes are not doing it right and crashing WordPress.

Author: kprovance

CHANGELOG.md

@@ -6,6 +6,7 @@
 * Fixed: jQuery deprecation notices in `typography` JavaScript.
 * Fixed: Error in connection banner on first-time activation.
 * Fixed: Missing redux-banner-admin.min.js file.
+* Fixed: Added extra check for the existance of the function name with callbacks. Some themes are not doing it right and crashing WordPress.
 
 ## 4.4.3
 * Fixed: Typo in JavaScript enqueue handle broke `typography` and `slider` fields.

readme.txt

@@ -120,6 +120,7 @@ NOTE: Redux is not intended to be used on its own. It requires a config file pro
 * Fixed: jQuery deprecation notices in `typography` JavaScript.
 * Fixed: Error in connection banner on first-time activation.
 * Fixed: Missing redux-banner-admin.min.js file.
+* Fixed: Added extra check for the existance of the function name with callbacks. Some themes are not doing it right and crashing WordPress.
 
 = 4.4.3 =
 * Fixed: Typo in JavaScript enqueue handle broke `typography` and `slider` fields.

redux-core/inc/classes/class-redux-wordpress-data.php

@@ -466,7 +466,7 @@ private function get_data( string $type, $args, $current_value ) {
 					break;
 
 				case 'callback':
-					if ( ! empty( $args ) ) {
+					if ( ! empty( $args ) && function_exists( $args ) ) {
 						$data = call_user_func( $args, $current_value );
 					}