The mod Will-o'-the-Wisps Unofficial Fork (0.3.32) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Will-o-the-Wisps-4::on_nth_tick(47)
LuaEntity doesn't contain key get_merged_signals.
stack traceback:
[C]: in function 'index'
__Will-o-the-Wisps-4/control.lua:631: in function 'task_func'
Will-o-the-Wisps-4/control.lua:728: in function 'run_on_object_set'
Will-o-the-Wisps-4/control.lua:747: in function 'run_periodic_task'
Will-o-the-Wisps-4/control.lua:779: in function <Will-o-the-Wisps-4/control.lua:760>

get_merged_signals was removed in Factorio 2.0, though I had to guess what to replace it with. Try now please.

The mod Will-o'-the-Wisps Unofficial Fork (0.3.33) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Will-o-the-Wisps-4::on_nth_tick(47)
LuaConstantCombinatorControlBehavior doesn't contain key parameters.
stack traceback:
[C]: in function 'index'
__Will-o-the-Wisps-4/control.lua:636: in function 'task_func'
Will-o-the-Wisps-4/control.lua:728: in function 'run_on_object_set'
Will-o-the-Wisps-4/control.lua:747: in function 'run_periodic_task'
Will-o-the-Wisps-4/control.lua:779: in function <Will-o-the-Wisps-4/control.lua:760>

How do I reproduce this? Just place a wisp detector? (I've not been playing enough recently to do much testing.)

litterally just place it, a second later it crashes