diff --git a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/utils/MCOptionUtils.java b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/utils/MCOptionUtils.java
index 152d5c81d..f0ecdd792 100644
--- a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/utils/MCOptionUtils.java
+++ b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/utils/MCOptionUtils.java
@@ -7,7 +7,7 @@ import net.kdt.pojavlaunch.*;
 
 public class MCOptionUtils
 {
-    private static final List<String> mLineList = new ArrayList<>();
+    private static final List<String> mLineList = Collections.synchronizedList(new ArrayList<>());
     
     public static void load() {
         mLineList.clear();