Ticket #44927: 44927.patch

src/wp-includes/link-template.php

@@ -4052 +4052 @@
          */
         $args = apply_filters( 'pre_get_avatar_data', $args, $id_or_email );
 
-        if ( isset( $args['url'] ) && ! is_null( $args['url'] ) ) {
+        if ( isset( $args['url'] ) ) {
                 /** This filter is documented in wp-includes/link-template.php */
                 return apply_filters( 'get_avatar_data', $args, $id_or_email );
         }