diff --git a/src/apps.js b/src/apps.js
index 6d616c383..4ca804e46 100644
--- a/src/apps.js
+++ b/src/apps.js
@@ -1407,8 +1407,10 @@ function repair(appId, data, auditSource, callback) {
 
         tasks.get(appError.taskId || '', function (error, task) {
             let args = !error ? task.args[1] : {}; // the first argument is the app id
-            args.restoreConfig = data.backupId ? { backupId: data.backupId, backupFormat: data.backupFormat, oldManifest: app.manifest } : null; // when null, apptask simply reinstalls
-            args.overwriteDns = 'overwriteDns' in data ? data.overwriteDns : false;
+            if ('backupId' in data) {
+                args.restoreConfig = data.backupId ? { backupId: data.backupId, backupFormat: data.backupFormat, oldManifest: app.manifest } : null; // when null, apptask simply reinstalls
+            }
+            if ('overwriteDns' in data) args.overwriteDns = data.overwriteDns;
 
             // create a new task instead of updating the old one, since it helps tracking
             addTask(appId, newState, { args, values, requiredState: exports.ISTATE_ERROR }, function (error, result) {