diff --git a/src/routes/cloudron.js b/src/routes/cloudron.js
index 064ccf7be..9be3aee06 100644
--- a/src/routes/cloudron.js
+++ b/src/routes/cloudron.js
@@ -133,6 +133,7 @@ function migrate(req, res, next) {
 
     cloudron.migrate(req.body, function (error) { // pass req.body because 'domain' can have arbitrary options
         if (error && error.reason === CloudronError.BAD_STATE) return next(new HttpError(409, error.message));
+        if (error && error.reason === CloudronError.BAD_FIELD) return next(new HttpError(400, error.message));
         if (error) return next(new HttpError(500, error));
 
         next(new HttpSuccess(202, {}));