The mod "Signal Display" (v 1.3.1) crashes when placing Display Panels in the sandbox. I am unsure if this is a Signal Display mod bug, or a bug from the Blueprint Sandbox mod, so I am leaving reports of this bug in either location. Save file to reproduce: https://mega.nz/file/4KN1xCaD#wHARnMr7ApJ_1zaX8uDkYKIP8xm5g8HpYwfZd9Qzfxo

The text of the crash:
The mod Signal Display (1.3.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event signal-display::on_nth_tick(2)
invalid key to 'next'
stack traceback:
[C]: in function 'next'
signal-display/scripts/events.lua:24: in function <signal-display/scripts/events.lua:9>

Looks like it’s an error in my mod.
I’ll see if I can figure out what the blueprint display mod is doing and add a check or compatibility.

Thanks for your report and save file (nice base btw, like the science count with displays)

Fixed in 1.4.0.

Fix crash due to invalid state after a surface is cleared

I've added a migration script that should fix the invalid state.

Thank you AckEmma, I appreciate it! I love your mod, it is really nice to see live updating values for signals, I am super pleased to be able to use it again!

edit
The progress bars are from the amazing work of another Factorio player. It is very tedious to make by hand so a python script was created:
https://gist.github.com/Gegell/fe78dc06baf1bfeba228d3822d450189
https://www.reddit.com/r/factorio/comments/1ghc3rs/comment/luwaeri/

I tweaked it to add science pack icons, and I am still very happy with it lol.

I could probably make a progress bar feature so it can easily be configured in game.
Interested?