Fix for the --nosound crash

apps/openmw/mwsound/soundmanager.cpp

@@ -67,6 +67,7 @@ namespace MWSound
         , updater(mgr)
         , cameraTracker(mgr)
         , mCurrentPlaylist(NULL)
+        , mUsingSound(useSound)
     {
         if(useSound)
         {
@@ -104,10 +105,13 @@ namespace MWSound
       }
 
     SoundManager::~SoundManager()
+    {
+        if(mUsingSound)
         {
             Ogre::Root::getSingleton().removeFrameListener(&updater);
             cameraTracker.unfollowCamera();
         }
+    }
 
     // Convert a soundId to file name, and modify the volume
     // according to the sounds local volume setting, minRange and

apps/openmw/mwsound/soundmanager.hpp

@@ -82,6 +82,8 @@ namespace MWSound
 
             IDMap mLoopedSounds;
 
+            bool mUsingSound;
+
             std::string lookup(const std::string &soundId,
                        float &volume, float &min, float &max);
             void add(const std::string &file,