The mod Factory Palette (0.1.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event factory-palette::fpal-confirm (ID 435)
factory-palette/handlers.lua:106: attempt to index field 'gui_data' (a nil value)
stack traceback:
factory-palette/handlers.lua:106: in function 'fn'
factory-palette/handlers.lua:20: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>
when open inventory after removing companions mod

The mod Factory Palette (0.4.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event factory-palette::fpal-confirm (ID 435)
factory-palette/handlers.lua:106: attempt to index field 'gui_data' (a nil value)
stack traceback:
factory-palette/handlers.lua:106: in function 'fn'
factory-palette/handlers.lua:20: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>

if you remove companions then load then open inventory it crashes. if you open an assembler first it doesn't

Should be fixed on 0.4.2. Thanks for the report!