New Error.

Error while running event UltimateResearchQueue2-mendy-fix::on_gui_click (ID 1)
flib/gui.lua:39: attempt to index local 'def' (a nil value)
stack traceback:
flib/gui.lua:39: in function 'add'
UltimateResearchQueue2-mendy-fix/gui.lua:658: in function 'update_tech_info'
UltimateResearchQueue2-mendy-fix/gui.lua:285: in function 'select_technology'
UltimateResearchQueue2-mendy-fix/gui.lua:215: in function 'handler'
UltimateResearchQueue2-mendy-fix/gui.lua:1060: in function 'wrapper'
flib/gui.lua:147: in function 'handler'
flib/gui.lua:177: in function <flib/gui.lua:160>