From b9d3c3ccb6070024400034817b734fa1ea8387bd Mon Sep 17 00:00:00 2001
From: mfranz <mfranz>
Date: Thu, 9 Mar 2006 13:30:28 +0000
Subject: [PATCH] check if the "nasal" subsystem is still there, and only call
 <unload> then. This isn't the case if the model is destroyed on fgfs exit. To
 make <unload> work under these circumstances, one would have to reorder
 subsystem removal, but this doesn't seem overly useful, so we'll do it when
 we really need it.

---
 src/Scripting/NasalSys.cxx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Scripting/NasalSys.cxx b/src/Scripting/NasalSys.cxx
index 7e8cba465..486f5a189 100644
--- a/src/Scripting/NasalSys.cxx
+++ b/src/Scripting/NasalSys.cxx
@@ -697,6 +697,9 @@ FGNasalModelData::~FGNasalModelData()
         return;
 
     FGNasalSys *nas = (FGNasalSys *)globals->get_subsystem("nasal");
+    if (!nas)
+        return;
+
     if (_unload) {
         const char *s = _unload->getStringValue();
         nas->createModule(_module.c_str(), _module.c_str(), s, strlen(s));
-- 
2.39.5