Game crashes when i copy a specific book. Doesnt crash if i copy any of the internal bps, or the book that that book is inside. i have zero clue why this mod is creating a problem there as it should have no input on this.
im using version 0.4.3 of this mod on version 1.1 of factorio (Dont wanna play 2.0 without the dlc, also SE)

Crash Report:

The mod Blueprint Signals (continued) (0.4.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event BlueprintSignals_continued::on_player_cursor_stack_changed (ID 31)
Index out of inventory bounds.
stack traceback:
[C]: in function 'index'
__BlueprintSignals_continued/util.lua:16: in function 'get_blueprint'
BlueprintSignals_continued/gui.lua:62: in function 'update_visibility'
BlueprintSignals_continued/control.lua:133: in function '?'
BlueprintSignals_continued/control.lua:35: in function <BlueprintSignals_continued/control.lua:33>

With mod version 1.0.0 I did a complete rewrite of the mod. The mod was forked by me from GaticusHax. Reason for that (the rewrite) was mainly that there was so much code in it which was not needed (in my opinion) for the base functionality of this mod. Previously it was very hard for me to maintain the mod and keep it updated according to changes made in the base game. And this not needed code is the reason for your crash. The event "on_player_cursor_stack_changed" is not needed, but the mod registered an event handler for it nonetheless.

TL;DR: I cannot give any support if you're not willing to update. I'm sorry.

Best would be if you share the blueprint book which gets you in trouble. It might be that there is something unusual in there, maybe gaps bewteen blueprints.