When this mod is enabled, trying to create a new empty blueprint book causes an instant game crash:

Error while running event BlueprintSignals::on_player_cursor_stack_changed (ID 29)
Index out of inventory bounds.
stack traceback:
BlueprintSignals/util.lua:11: in function 'get_blueprint'
BlueprintSignals/gui.lua:102: in function 'update_visibility'
BlueprintSignals/control.lua:124: in function '?'
BlueprintSignals/control.lua:36: in function <BlueprintSignals/control.lua:34>
stack traceback:
[C]: in function 'index'
__BlueprintSignals/util.lua:11: in function 'get_blueprint'
BlueprintSignals/gui.lua:102: in function 'update_visibility'
BlueprintSignals/control.lua:124: in function '?'
BlueprintSignals/control.lua:36: in function <BlueprintSignals/control.lua:34>
79.964 Error ServerMultiplayerManager.cpp:90: MultiplayerManager failed: "The mod Blueprint Signals (0.1.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event BlueprintSignals::on_player_cursor_stack_changed (ID 29)
Index out of inventory bounds.
stack traceback:
BlueprintSignals/util.lua:11: in function 'get_blueprint'
BlueprintSignals/gui.lua:102: in function 'update_visibility'
BlueprintSignals/control.lua:124: in function '?'
BlueprintSignals/control.lua:36: in function <BlueprintSignals/control.lua:34>
stack traceback:
[C]: in function 'index'
__BlueprintSignals/util.lua:11: in function 'get_blueprint'
BlueprintSignals/gui.lua:102: in function 'update_visibility'
BlueprintSignals/control.lua:124: in function '?'
BlueprintSignals/control.lua:36: in function <BlueprintSignals/control.lua:34>"

I get the same ... so its not usable.

Same for me :( Wery good mod but that issue..
Anyone know an useful alternative?

I'm looking at it now. I'm a dogshit lua developer, but I'm trying to debug his code. If I find a solution, I'll drop it here. So far, from what I understand, the get_blueprint() function call on line 11 is bad.

I fixed it!!! IT WORKS and it works in 1.0!!!!!!!!!!!!

https://github.com/Haxtorio/BlueprintSignals/issues/1#issuecomment-724475456

I've updated the mod and v0.2.0 is being published right now. Thanks smartguy1196.

Thank you so much to both of you for fixing the issue and making a new release :)