The mod Highlight rail signals (1.1.5) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event highlight-rail-signals::on_nth_tick(60)
__highlight-rail-signals__/control.lua:6: attempt to index field 'cursor_stack' (a nil value)
stack traceback:
    __highlight-rail-signals__/control.lua:6: in function 'get_cursor_prototype'
    __highlight-rail-signals__/control.lua:126: in function 'draw_rail_signal_circles'
    __highlight-rail-signals__/control.lua:233: in function <__highlight-rail-signals__/control.lua:232>

I believe the above error is caused when the player is in a cutscene. It occurs for me when starting a new game during the crashed ship intro cutscene, and while in the Player Recycling mod's recycling cutscene when recycling yourself.

Thanks for reporting this. Fixed for version 1.1.6.