Ticket #21786: 21786.patch

wp-includes/capabilities.php

@@ -868 +868 @@
          * @param string $cap Capability name.
          */
         function remove_cap( $cap ) {
-                if ( empty( $this->caps[$cap] ) )
+                if ( ! isset( $this->caps[$cap] ) )
                         return;
                 unset( $this->caps[$cap] );
                 update_user_meta( $this->ID, $this->cap_key, $this->caps );