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00007FFAF162E70E (ntdll): (filename not available): KiUserExceptionDispatcher
c:\cygwin64\tmp\factorio-build-ocil06\src\entity\inserter.cpp (974): Inserter::dropHeldItem
c:\cygwin64\tmp\factorio-build-ocil06\src\entity\inserter.cpp (1100): Inserter::update
c:\cygwin64\tmp\factorio-build-ocil06\src\surface\chunk.cpp (555): Chunk::updateActiveEntities
c:\cygwin64\tmp\factorio-build-ocil06\src\surface\chunk.cpp (604): Chunk::updateEntities
c:\cygwin64\tmp\factorio-build-ocil06\src\surface\surface.cpp (1362): Surface::update
c:\cygwin64\tmp\factorio-build-ocil06\src\map\map.cpp (1435): Map::updateEntities
c:\cygwin64\tmp\factorio-build-ocil06\src\game.cpp (189): Game::update

Save file is attached.

Context: I'm replacing my existing copper drop-off at the top-right of the main base. There's a train there that has no path but has some copper ore left in it because the conditions to leave the station have been met. On setting the train to manual to force the existing copper ore to unload, then marking the train and the unloader assembly for deconstruction, I get a crash to desktop. Replicated this twice.

At a guess I'd say that the inserter is getting removed then the dropHeldItem event fired the next tick, causing a null reference exception.

confirm. Can recreate crash from this autosave.

Same stack trace:
Also i have managed to prepare save with described actions, save it (rockyb_autosave3_prep) and it reproduces crash all the times.
Steps to reproduce:
1/ Load rockyb_autosave3_prep.zip
2/ Wait 10 seconds
3/ Crash (100% crash rate, tested 3 times)

-- edit1:

rockyb_autosave3_prep.zip still crashes in [0.17.5]

Thanks for the report and the save file(s). It's now fixed for the next version of 0.17.