Ticket #39920: 39920-3.patch

src/wp-admin/includes/misc.php

@@ -71 +71 @@
                 return $result;
         }
 
-        if ( $markerdata = explode( "\n", implode( '', file( $filename ) ) ));
-        {
+        $markerdata = explode( "\n", implode( '', file( $filename ) ) );
+
+        if ( ! empty( $markerdata ) ) {
                 $state = false;
                 foreach ( $markerdata as $markerline ) {
                         if (strpos($markerline, '# END ' . $marker) !== false)