Fixed bug where doing SpeedWalkDelay during world close would cause a crash

Author: nickgammon

doc_construct.cpp

@@ -483,6 +483,7 @@ int i;
     {
 	  m_pTimerWnd->DestroyWindow();
 	  delete m_pTimerWnd;
+    m_pTimerWnd = NULL;
     }
 
   for (i = 0; i < 8; i++)  

serialize.cpp

@@ -92,7 +92,8 @@ void CMUSHclientDoc::Serialize(CArchive& ar)
     } // end compiling regular expression
 
   // kick off speed walk timer
-  m_pTimerWnd->ChangeTimerRate (m_iSpeedWalkDelay);
+  if (m_pTimerWnd)
+    m_pTimerWnd->ChangeTimerRate (m_iSpeedWalkDelay);
 
   // remember loaded option values