Tweak shutdown code, chasing intermittent segfaults on shutdown.

diff --git a/src/Main/globals.cxx b/src/Main/globals.cxx
index 33f36ecc82501c3e6d49984b4d4b98d62f087970..db6eef28c1412a3f717483cce18e672ae2860c2e 100644 (file)
--- a/src/Main/globals.cxx
+++ b/src/Main/globals.cxx
@@ -167,6 +167,7 @@ FGGlobals::~FGGlobals()
     // shut down all subsystems, make sure we take down the 
     // AIModels system first.
     SGSubsystem* ai = subsystem_mgr->remove("ai_model");
+    ai->unbind();
     delete ai;
     
     subsystem_mgr->unbind();