From 74accf6ddd68eee82c0998b23ef066c1b6115d5b Mon Sep 17 00:00:00 2001
From: David Bayliss <aravol.amakiir@gmail.com>
Date: Fri, 8 Jul 2022 11:08:58 -0600
Subject: [PATCH] Adding null check to value pop

---
 ink-engine-runtime/Story.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ink-engine-runtime/Story.cs b/ink-engine-runtime/Story.cs
index cd9a5cef..5ac9d30f 100644
--- a/ink-engine-runtime/Story.cs
+++ b/ink-engine-runtime/Story.cs
@@ -1838,7 +1838,7 @@ public void CallExternalFunction(string funcName, int numberOfArguments)
             var arguments = new List<object>();
             for (int i = 0; i < numberOfArguments; ++i) {
                 var poppedObj = state.PopEvaluationStack () as Value;
-                var valueObj = poppedObj.valueObject;
+                var valueObj = poppedObj?.valueObject;
                 arguments.Add (valueObj);
             }