Placed the dart radar in Blueprint sandboxes. Trying to deconstruct it leads to an error

2099.564 Error MainLoop.cpp:1468: Exception at tick 32674323: The mod Blueprint Sandboxes (3.2.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event blueprint-sandboxes::on_marked_for_deconstruction (ID 28)
The mod D.A.R.T. (1.2.5) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event dart::script_raised_destroy (ID 93)
__dart__/scripts/dart.lua:688: attempt to index field '?' (a nil value)
stack traceback:
        __dart__/scripts/dart.lua:688: in function 'func'
        __dart__/scripts/dart.lua:726: in function 'handler'
        __core__/lualib/event_handler.lua:72: in function <__core__/lualib/event_handler.lua:70>
stack traceback:
        [C]: in function 'destroy'
        __blueprint-sandboxes__/scripts/god.lua:53: in function 'handler'
        __blueprint-sandboxes__/scripts/god.lua:219: in function 'AsyncWrapper'
        __blueprint-sandboxes__/scripts/god.lua:267: in function <__blueprint-sandboxes__/scripts/god.lua:265>
2099.564 Error ServerMultiplayerManager.cpp:84: MultiplayerManager failed: "The mod Blueprint Sandboxes (3.2.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event blueprint-sandboxes::on_marked_for_deconstruction (ID 28)
The mod D.A.R.T. (1.2.5) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event dart::script_raised_destroy (ID 93)
__dart__/scripts/dart.lua:688: attempt to index field '?' (a nil value)
stack traceback:
        __dart__/scripts/dart.lua:688: in function 'func'
        __dart__/scripts/dart.lua:726: in function 'handler'
        __core__/lualib/event_handler.lua:72: in function <__core__/lualib/event_handler.lua:70>
stack traceback:
        [C]: in function 'destroy'
        __blueprint-sandboxes__/scripts/god.lua:53: in function 'handler'
        __blueprint-sandboxes__/scripts/god.lua:219: in function 'AsyncWrapper'
        __blueprint-sandboxes__/scripts/god.lua:267: in function <__blueprint-sandboxes__/scripts/god.lua:265>"
2099.565 Info ServerMultiplayerManager.cpp:808: updateTick(32674323) changing state from(InGame) to(Failed)

Could you please describe a bit more in detail, what you did before the error occurred?

I placed a dart manager and radar int eh blueprint sandboxes world. When i tried deconstructing it, the error occurs

Thx - that helped. Was able to reproduce the error. It will take some time to analyze what happens exactly

Just published V 1.2.6 with the fix for that error. Thx for reporting.

The mod D.A.R.T. (1.2.6) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event dart::on_gui_click (ID 1)
LuaEntity doesn't contain key visible.
stack traceback:
[C]: in function 'newindex'
__dart/scripts/gui/eventHandler.lua:135: in function 'handler'
dart/scripts/gui/eventHandler.lua:164: in function 'wrapper'
flib/gui.lua:147: in function 'handler'
flib/gui.lua:177: in function 'handler'
core/lualib/event_handler.lua:72: in function <core/lualib/event_handler.lua:70>

This happened after I placed a FCC on a spacestation, wired some modular turrets to it, opened the GUI and closed it again. It doesn't matter if I click the x top right, use ESC to close the window, when it closes the save crashes to the mainmenu.
Do you need anything else?

Were you using Blueprint sandboxes when placing or opening the FCC?

If not - why did you add your post to this thread? At the moment I can't see any relation to the former problem ...

Oh yes - and which GUI exactly did you open? That from the FCC or that from a turret?