Ticket #3402: 3402.2.diff

src/includes/users/template.php

@@ -487 +487 @@
                         'force'   => ''
                 ), 'get_user_nicename' );
 
-                // Get the user data and nicename
-                if ( empty( $r['force'] ) ) {
-                        $user     = get_userdata( $user_id );
-                        $nicename = $user->user_nicename;
+                // Force the nicename (likely from a previous user query)
+                if ( ! empty( $r['force'] ) ) {
+                        $nicename = (string) $r['force'];
 
-                // Force the nicename to something else
+                // Maybe fallback to getting the nicename from user data
+                } elseif ( ! empty( $r['user_id'] ) ) {
+                        $user     = get_userdata( $r['user_id'] );
+                        $nicename = ! empty( $user )
+                                ? $user->user_nicename
+                                : '';
+
+                // Maybe fallback to empty string so filter still applies
                 } else {
-                        $nicename = (string) $r['force'];
+                        $nicename = '';
                 }
 
                 // Maybe wrap the nicename