From 327edcd34736d0cbf93428b08602b86b247c1ee1 Mon Sep 17 00:00:00 2001
From: Anuken <arnukren@gmail.com>
Date: Fri, 12 Oct 2018 09:57:44 -0400
Subject: [PATCH] Fixed map crash

---
 core/src/io/anuke/mindustry/maps/Maps.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/core/src/io/anuke/mindustry/maps/Maps.java b/core/src/io/anuke/mindustry/maps/Maps.java
index 46370d808b..d97cdbfa9e 100644
--- a/core/src/io/anuke/mindustry/maps/Maps.java
+++ b/core/src/io/anuke/mindustry/maps/Maps.java
@@ -77,6 +77,10 @@ public class Maps implements Disposable{
     /**Save a map. This updates all values and stored data necessary.*/
     public void saveMap(String name, MapTileData data, ObjectMap<String, String> tags){
         try {
+            //create copy of tags to prevent mutation later
+            ObjectMap<String, String> newTags = new ObjectMap<>();
+            newTags.putAll(tags);
+            tags = newTags;
             if (!gwt) {
                 FileHandle file = customMapDirectory.child(name + "." + mapExtension);
                 MapIO.writeMap(file.write(false), tags, data);