The mod Signal Controlled Trains (1.0.0) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event Signal_Controlled_Trains::on_nth_tick(1)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__Signal_Controlled_Trains/scripts/poll.lua:5: in function 'callback'
flib/table.lua:258: in function 'for_n_of'
Signal_Controlled_Trains/scripts/poll.lua:75: in function 'poll_train_stops'
Signal_Controlled_Trains/scripts/main.lua:92: in function <Signal_Controlled_Trains/scripts/main.lua:87>
Happens when picking up a train signal.