The mod Smart Inserters (2.0.4) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event Smart_Inserters::on_gui_opened (ID 95)
yafla/scripts/experimental/gui_builder.lua:87: Element with index 619 already has handlers
stack traceback:
[C]: in function 'error'
yafla/scripts/experimental/gui_builder.lua:87: in function 'add_actions'
yafla/scripts/experimental/gui_builder.lua:143: in function 'build'
yafla/scripts/experimental/gui_builder.lua:148: in function 'build'
yafla/scripts/experimental/gui_builder.lua:148: in function 'build'
yafla/scripts/experimental/gui_builder.lua:148: in function 'build'
yafla/scripts/experimental/gui_builder.lua:148: in function 'build'
yafla/scripts/experimental/gui_builder.lua:148: in function 'build'
Smart_Inserters/scripts/selector_gui.lua:322: in function 'create'
Smart_Inserters/control.lua:61: in function <Smart_Inserters/control.lua:55>
In multiplayer the UI appears to get glitched sometimes if more than one person is edititing offsets.