engine.dll crashes when running the game using custom launcher

[theOneTrueFunniBoi]

Right after 'execing valve.rc', the engine dll encounters an access violation.

The exact error is as follows: Exception thrown at 0x00007FF8301D09E7 (engine.dll) in mod_tf_win64.exe: 0xC0000005: Access violation reading location 0x0000000000000000.

The code breakpoints at if ( engine->IsPlayingDemo() ) in SetupViews() of view.cpp on the client side.

For some reason, it doesn't do this when running the mod using the source 2013 sdk multiplayer base hl2mp_win64.exe. Any help would be appreciated.