From 3639656ada5f81827d221948aeff5c217b2f7feb Mon Sep 17 00:00:00 2001
From: msm <msm@tailcall.net>
Date: Mon, 27 Dec 2021 23:06:47 +0100
Subject: [PATCH] Fix a undefined variable dereference

---
 src/v1/kaitaiWorker.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/v1/kaitaiWorker.ts b/src/v1/kaitaiWorker.ts
index 2c6bdcae..8a377112 100644
--- a/src/v1/kaitaiWorker.ts
+++ b/src/v1/kaitaiWorker.ts
@@ -89,7 +89,7 @@ function exportValue(obj: any, debug: IDebugInfo, path: string[], noLazy?: boole
             Object.getOwnPropertyNames(obj.constructor.prototype).filter(x => x[0] !== "_" && x !== "constructor") : [];
 
         for (const propName of propNames) {
-            const ksyInstanceData = ksyType && ksyType.instancesByJsName[propName] || {};
+            const ksyInstanceData = ksyType && ksyType.instancesByJsName && ksyType.instancesByJsName[propName] || {};
             const parseMode = ksyInstanceData["-webide-parse-mode"];
             const eagerLoad = parseMode === "eager" || (parseMode !== "lazy" && ksyInstanceData.value);