From 17382d7c7e44965972fdbf7f7bdaf28ced09ebcf Mon Sep 17 00:00:00 2001
From: Alexander Batalov <alex.batalov@gmail.com>
Date: Sat, 6 Aug 2022 12:46:05 +0300
Subject: [PATCH] Fix poping uninitialized pointer

Closes #113
---
 src/interpreter.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/interpreter.cc b/src/interpreter.cc
index 03662e6..9388481 100644
--- a/src/interpreter.cc
+++ b/src/interpreter.cc
@@ -3033,6 +3033,14 @@ char* programStackPopString(Program* program)
 void* programStackPopPointer(Program* program)
 {
     ProgramValue programValue = programStackPopValue(program);
+
+    // There are certain places in the scripted code where they refer to
+    // uninitialized exported variables designed to hold objects (pointers).
+    // If this is one theses places simply return NULL.
+    if (programValue.opcode == VALUE_TYPE_INT && programValue.integerValue == 0) {
+        return NULL;
+    }
+
     if (programValue.opcode != VALUE_TYPE_PTR) {
         programFatalError("pointer expected, got %x", programValue.opcode);
     }