The mod Train tunnels caused a non-recoverable error.
Please report this error to the mod author.

Error while running event traintunnels::on_train_changed_state (ID 23)
traintunnels/control.lua:1081: attempt to index field 'wait_conditions' (a nil value)
stack traceback:
traintunnels/control.lua:1081: in function <traintunnels/control.lua:1002>

Crash on Tunnel removal!
The mod Train tunnels caused a non-recoverable error.
Please report this error to the mod author.

Error while running event traintunnels::on_player_mined_entity (ID 65)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
traintunnels/control.lua:882: in function <traintunnels/control.lua:878>
stack traceback:
[C]: in function 'index'
__traintunnels/control.lua:882: in function <traintunnels/control.lua:878>

Crashed once I removed a moving train heading towards a tunnel.

Thanks. Should be fixed in the new release. Also removed the debug coloring :D