diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/game/LauncherHelper.java b/HMCL/src/main/java/org/jackhuang/hmcl/game/LauncherHelper.java
index 960a98366..33fc9ed4c 100644
--- a/HMCL/src/main/java/org/jackhuang/hmcl/game/LauncherHelper.java
+++ b/HMCL/src/main/java/org/jackhuang/hmcl/game/LauncherHelper.java
@@ -241,7 +241,7 @@ public final class LauncherHelper {
                         launchingStepsPane.fireEvent(new DialogCloseEvent());
                         if (!success) {
                             Exception ex = executor.getException();
-                            if (!(ex instanceof CancellationException)) {
+                            if (ex != null && !(ex instanceof CancellationException)) {
                                 String message;
                                 if (ex instanceof ModpackCompletionException) {
                                     if (ex.getCause() instanceof FileNotFoundException)