Here's the trace. Also how do you get a % symbol to show in the icon value?

2149.880 Error MainLoop.cpp:1285: Exception at tick 26708048: The mod Programmable Speaker Alerts List 2 (1.1.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event AlertsList2::on_tick (ID 0)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__AlertsList2/control.lua:166: in function 'fill_table_with_speakers'
AlertsList2/control.lua:213: in function 'draw_gui'
AlertsList2/control.lua:250: in function <AlertsList2/control.lua:247>

Could you please elaborate? What are you doing prior to the crash? What other mods have you installed?

Same here. happens when trying to deconstruct other entities with nanobots.

The mod Programmable Speaker Alerts List 2 (1.1.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event AlertsList2::on_tick (ID 0)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__AlertsList2/control.lua:166: in function 'fill_table_with_speakers'
AlertsList2/control.lua:213: in function 'draw_gui'
AlertsList2/control.lua:250: in function <AlertsList2/control.lua:247>

Could you add some more information? Like what mods are you using? Which Factorio version you have?

This error can also be reproduced by deconstructing a speaker in editor mode. Any settings including just built and either /editor in regular map or separate Editor Extensions map should do it.

I tried that. No bad things happen on my side. I have a hint of what is happening, but without the possibility of testing I rather not publish it. Could you tell me what Mods you are using?

I just backed up and deleted all my mods except Editor Extensions, flib, and this one. Client is standalone version 1.1.49 experimental although it's happened in earlier nonexperimental ones too. Then I created a new EE map and crafted a speaker in editor mode, deconstructed, error. Finally I deleted EE and flib, and created a new default freeplay world, /editor /editor, crafted and deconstructed speaker, unpaused the time, same error again.

I will try to reproduce it with Editor Extensions and flib installed. I do not use those mods.

I could now reproduce the problem and I found a fix. See version 1.2.1

Thanks, deconstruct and editor brush remove them normally now :)

You are very welcome :-)