The mod Bulk Rail Loader (1.1.4) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event railloader::on_player_setup_blueprint (ID 70)
railloader/control.lua:356: bad argument #1 of 2 to 'pairs' (table expected, got nil)
stack traceback:
[C]: in function 'pairs'
railloader/control.lua:356: in function <railloader/control.lua:346>

Edit: Thank you!

Fixed in v1.1.5.

I am sorry to say but the error is still in even on version 1.1.5 .

Replicate steps:

1# Inside The Blueprint Lab zone.
2# Create blueprint in editor mode
3# Try to create the library blueprint (Alt+B)

Error image at https://ibb.co/CWDNh8X .

This is a different bug, and I cannot reproduce it. Can you provide more detailed reproduction steps? Which "Blueprint Lab" mod are you using? https://mods.factorio.com/mod/EditorExtensions? https://mods.factorio.com/mod/BlueprintLab_design? A different one? Please give exact steps and/or a video.

Hi and sorry for the late reply ...
I am using Blueprint Lab (second link).
The steps are right as i described above , error happens right when you try to create the blueprint (alt B) . I have found out that if you exit the editor mode (/editor) the error will not occur.
Using a bunch of mods also so that might make a difference (SE, K2, miniloaders etc ... let me know if you need a full mod list)
Cheers.