diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/game/HMCLGameRepository.java b/HMCL/src/main/java/org/jackhuang/hmcl/game/HMCLGameRepository.java
index de31c8759..d8ae0029e 100644
--- a/HMCL/src/main/java/org/jackhuang/hmcl/game/HMCLGameRepository.java
+++ b/HMCL/src/main/java/org/jackhuang/hmcl/game/HMCLGameRepository.java
@@ -158,9 +158,10 @@ public class HMCLGameRepository extends DefaultGameRepository {
         File iconFile = getVersionIconFile(id);
         if (iconFile.exists())
             return new Image("file:" + iconFile.getAbsolutePath());
-        else if ("net.minecraft.launchwrapper.Launch".equals(version.getMainClass())
-                || version.getMainClass().startsWith("net.fabricmc")
-                || "cpw.mods.modlauncher.Launcher".equals(version.getMainClass()))
+        else if (version.getMainClass() != null &&
+                ("net.minecraft.launchwrapper.Launch".equals(version.getMainClass())
+                        || version.getMainClass().startsWith("net.fabricmc")
+                        || "cpw.mods.modlauncher.Launcher".equals(version.getMainClass())))
             return newImage("/assets/img/furnace.png");
         else
             return newImage("/assets/img/grass.png");