The mod Module Inserter (5.2.4) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event ModuleInserter::on_gui_click (ID 1)
ModuleInserter/scripts/gui.lua:434: attempt to index local 'row' (a nil value)
stack traceback:
ModuleInserter/scripts/gui.lua:434: in function 'update_row'
ModuleInserter/scripts/gui.lua:458: in function 'update_contents'
ModuleInserter/scripts/gui.lua:770: in function 'handler'
ModuleInserter/control.lua:697: in function <ModuleInserter/control.lua:689>