From 12d03f26076abe72e30a13634ef76e591ced4784 Mon Sep 17 00:00:00 2001
From: seke <sebastian.kerckhof@barco.com>
Date: Fri, 23 Jun 2017 13:51:30 +0200
Subject: [PATCH] Don't modify the input variables when creating upsert
 document

---
 packages/minimongo/minimongo.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/minimongo/minimongo.js b/packages/minimongo/minimongo.js
index 5997e80dd9..8a17490a2e 100644
--- a/packages/minimongo/minimongo.js
+++ b/packages/minimongo/minimongo.js
@@ -1156,6 +1156,7 @@ LocalCollection._createUpsertDocument = function (selector, modifier) {
     return newDoc
   } else {
     // Replacement can take _id from query document
+    modifier = EJSON.clone(modifier);
     if (newDoc._id) {
       modifier._id = newDoc._id;
     }