OpenMW 0.48 RC9 Access violation on exit

Reported here: https://forum.openmw.org/viewtopic.php?p=73671#p73671

Unhandled exception at 0x00007FFE35E923BE (osg.dll) in openmw-crash.dmp: 0xC0000005: Access violation reading location 0xFFFFFFFFFFFFFFFF.

Stack trace (the user renamed openmw.exe to Morrowind Launcher.exe):

 	[Inline Frame] osg.dll!osg::ref_ptr<osg::Texture::TextureObject>::operator=(osg::Texture::TextureObject *) Line 71	C++
 	[Inline Frame] osg.dll!osg::Texture::setTextureObject(unsigned int contextID, osg::Texture::TextureObject *) Line 676	C++
>	osg.dll!osg::TextureObjectSet::deleteAllTextureObjects() Line 577	C++
 	osg.dll!osg::TextureObjectManager::deleteAllGLObjects() Line 1157	C++
 	osg.dll!osg::ContextData::deleteAllGLObjects() Line 112	C++
 	osg.dll!osg::GraphicsContext::close(bool callCloseImplementation) Line 485	C++
 	osgViewer.dll!osgViewer::Viewer::~Viewer() Line 266	C++
 	osgViewer.dll!osgViewer::Viewer::`vbase destructor'()	C++
 	Morrowind Launcher.exe!osgViewer::Viewer::`scalar deleting destructor'(unsigned int)	C++
 	osg.dll!osg::Referenced::signalObserversAndDelete(bool signalDelete, bool doDelete) Line 294	C++
 	osg.dll!osg::Referenced::unref() Line 203	C++
 	[Inline Frame] Morrowind Launcher.exe!osg::ref_ptr<osgViewer::Viewer>::operator=(osgViewer::Viewer *) Line 78	C++
 	Morrowind Launcher.exe!OMW::Engine::~Engine() Line 514	C++
 	Morrowind Launcher.exe!OMW::Engine::`scalar deleting destructor'(unsigned int)	C++
 	[Inline Frame] Morrowind Launcher.exe!std::default_delete<OMW::Engine>::operator()(OMW::Engine *) Line 3090	C++
 	[Inline Frame] Morrowind Launcher.exe!std::unique_ptr<OMW::Engine,std::default_delete<OMW::Engine>>::{dtor}() Line 3198	C++
 	Morrowind Launcher.exe!runApplication(int argc, char * * argv) Line 229	C++
 	Morrowind Launcher.exe!wrapApplication(int(*)(int, char * *) innerApplication, int argc, char * * argv, const std::string & appName, bool autoSetupLogging) Line 326	C++
 	Morrowind Launcher.exe!main(int argc, char * * argv) Line 238	C++
 	[Inline Frame] Morrowind Launcher.exe!invoke_main() Line 78	C++
 	Morrowind Launcher.exe!__scrt_common_main_seh() Line 288	C++
 	kernel32.dll!BaseThreadInitThunk()	Unknown
 	ntdll.dll!RtlUserThreadStart()	Unknown