101.363 Error MainLoop.cpp:1456: Exception at tick 2594401: The mod Placeable Color Coded Pipes (0.0.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event placeable-color-coded-pipes::on_player_cursor_stack_changed (ID 37)
LuaGuiElement API call when LuaGuiElement was invalid.
stack traceback:
[C]: in function 'index'
__placeable-color-coded-pipes/interface/selector.lua:179: in function 'update_items'
...aceable-color-coded-pipes__/interface/cursor_handler.lua:120: in function 'update_item'
...aceable-color-coded-pipes__/interface/cursor_handler.lua:195: in function 'handler'
core/lualib/event_handler.lua:72: in function <core/lualib/event_handler.lua:70>
101.363 Error ServerMultiplayerManager.cpp:84: MultiplayerManager failed: "The mod Placeable Color Coded Pipes (0.0.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event placeable-color-coded-pipes::on_player_cursor_stack_changed (ID 37)
LuaGuiElement API call when LuaGuiElement was invalid.
stack traceback:
[C]: in function 'index'
__placeable-color-coded-pipes/interface/selector.lua:179: in function 'update_items'
...aceable-color-coded-pipes__/interface/cursor_handler.lua:120: in function 'update_item'
...aceable-color-coded-pipes__/interface/cursor_handler.lua:195: in function 'handler'
core/lualib/event_handler.lua:72: in function <core/lualib/event_handler.lua:70>"

This might be quite late, but the root problem of this has been fixed.
Sorry for not fixing it earlier, I was in no mood to mod at the time and then I forgot about it.