Happened when I opened Helmod and clicked purple science to insert the amount/minute.
It seems to happen whenever I click the output icon of an item from Helmod.

The mod Smart Inserters (2.0.5) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Smart_Inserters::on_gui_click (ID 1)
Smart_Inserters/scripts/selector_gui.lua:408: Opened is nil
stack traceback:
[C]: in function 'assert'
Smart_Inserters/scripts/selector_gui.lua:408: in function '?'
yafla/scripts/experimental/gui_builder.lua:63: in function <yafla/scripts/experimental/gui_builder.lua:53>

The mod Smart Inserters (2.0.5) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Smart_Inserters::on_gui_click (ID 1)
Smart_Inserters/scripts/selector_gui.lua:547: Opened is nil
stack traceback:
[C]: in function 'assert'
Smart_Inserters/scripts/selector_gui.lua:547: in function '?'
yafla/scripts/experimental/gui_builder.lua:63: in function <yafla/scripts/experimental/gui_builder.lua:53>

Ill check, thanks for the report

So this should be fixed, the strange part is that helmod seems to trigger some internal functions that should not be able to reach, IDK what's happening but should work.