diff --git a/manage_user_edit_page.php b/manage_user_edit_page.php
index 812d276fa7..3a22d0e45f 100644
--- a/manage_user_edit_page.php
+++ b/manage_user_edit_page.php
@@ -80,6 +80,10 @@
 }
 
 $t_user = user_get_row( $t_user_id );
+if( !$t_user ) {
+	error_parameters( $t_user_id );
+	trigger_error( ERROR_USER_BY_ID_NOT_FOUND, ERROR);
+}
 
 # Ensure that the account to be updated is of equal or lower access to the
 # current user.