Assertion failed: (mBufferPointer != NULL), function UploadLights, file src/gl/dynlights/gl_lightbuffer.cpp, 
line 159.

FLightBuffer::UploadLights(this=0x00006000002741c0, data=0x00000001010604b8) + 932 at gl_lightbuffer.cpp:159

GLFlat::SetupSubsectorLights(this=0x00000001224bea00, pass=0, sub=0x0000000125040f20, dli=0x00007fff5fbfc83c) 
+ 577 at gl_flats.cpp:151
GLFlat::DrawSubsectors(this=0x00000001224bea00, pass=4, processlights=true, istrans=true) + 259 at gl_flats.cpp:269

GLFlat::Draw(this=0x00000001224bea00, pass=4, trans=true) + 1357 at gl_flats.cpp:427
GLDrawList::DoDraw(this=0x0000000120404788, pass=4, i=17, trans=true) + 192 at gl_drawinfo.cpp:733
GLDrawList::DoDrawSorted(this=0x0000000120404788, head=0x0000618000245640) + 349 at gl_drawinfo.cpp:792

GLDrawList::DrawSorted(this=0x0000000120404788) + 234 at gl_drawinfo.cpp:840
GLSceneDrawer::RenderTranslucent(this=0x00007fff5fbfcd00) + 207 at gl_scene.cpp:449
GLSceneDrawer::DrawScene(this=0x00007fff5fbfcd00, drawmode=1) + 485 at gl_scene.cpp:518
GLSceneDrawer::ProcessScene(this=0x00007fff5fbfcd00, toscreen=false) + 286 at gl_scene.cpp:722
GLSceneDrawer::RenderViewpoint(this=0x00007fff5fbfcd00, camera=0x0000000120f32a00, bounds=0x00007fff5fbfcd60, 
fov=105, ratio=1.5, fovratio=1.5, mainview=false, toscreen=false) + 1521 at gl_scene.cpp:838
FGLInterface::RenderTextureView(this=0x0000610000005690, tex=0x00006080001c2ee0, Viewpoint=0x0000000120f32a00, 
FOV=105) + 376 at gl_scene.cpp:1120
FCanvasTextureInfo::UpdateAll() + 161 at r_utility.cpp:997
FGLRenderer::RenderView(this=0x000000010269fb40, player=0x0000000100f5ab40) + 271 at gl_scene.cpp:897

FGLInterface::RenderView(this=0x0000610000005690, player=0x0000000100f5ab40) + 35 at gl_scene.cpp:1071

D_Display() + 1609 at d_main.cpp:782
D_DoomLoop() + 663 at d_main.cpp:1036
D_DoomMain() + 6840 at d_main.cpp:2705