The mod Recursive Blueprints+ (1.3.14) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event rec-blue-plus::on_player_setup_blueprint (ID 70)
rec-blue-plus/control.lua:138: attempt to call field 'is_blueprint' (a boolean value)
stack traceback:
rec-blue-plus/control.lua:138: in function <rec-blue-plus/control.lua:127>