auth: Fixed potential crash.

diff --git a/src/auth/auth-request-handler.c b/src/auth/auth-request-handler.c
index 1a39f5fe79b7381e03fd22563c404c518ced179e..518f2937523fd1c6860c252cf8a82d59a7a5ab03 100644 (file)
--- a/src/auth/auth-request-handler.c
+++ b/src/auth/auth-request-handler.c
@@ -174,7 +174,7 @@ auth_str_append_extra_fields(struct auth_request *request, string_t *dest)
                           AUTH_FIELD_FLAG_HIDDEN, 0);
 
        if (request->original_username != NULL &&
-           strcmp(request->original_username, request->user) != 0) {
+           null_strcmp(request->original_username, request->user) != 0) {
                auth_str_add_keyvalue(dest, "original_user",
                                      request->original_username);
        }