The mod Logistic Request Helper (1.0.14) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event logistic-request-helper::lrh_increase_quality (ID 314)
logistic-request-helper/scripts/gui/gutil.lua:115: attempt to index local 'lb' (a nil value)
stack traceback:
logistic-request-helper/scripts/gui/gutil.lua:115: in function <logistic-request-helper/scripts/gui/gutil.lua:102>
(...tail calls...)
logistic-request-helper/control.lua:67: in function <logistic-request-helper/control.lua:65>

Of note: The UI was minimized (thank you for adding that function)

Another one, Deconstruction Planner with Inventory Open, produced the following error:

The mod Logistic Request Helper (1.0.14) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event logistic-request-helper::lrh_increase_quality (ID 314)
logistic-request-helper/scripts/gui/gutil.lua:115: attempt to index local 'lb' (a nil value)
stack traceback:
logistic-request-helper/scripts/gui/gutil.lua:115: in function <logistic-request-helper/scripts/gui/gutil.lua:102>
(...tail calls...)
logistic-request-helper/control.lua:67: in function <logistic-request-helper/control.lua:65>

And on a pipe in the inventory:

The mod Logistic Request Helper (1.0.14) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event logistic-request-helper::lrh_increase_quality (ID 314)
logistic-request-helper/scripts/gui/gutil.lua:115: attempt to index local 'lb' (a nil value)
stack traceback:
logistic-request-helper/scripts/gui/gutil.lua:115: in function <logistic-request-helper/scripts/gui/gutil.lua:102>
(...tail calls...)
logistic-request-helper/control.lua:67: in function <logistic-request-helper/control.lua:65>

Ok, the error happens when the UI is minimized.
Tested with the above items.

This is amazing! Have you considered (or do you have) a career in QA testing?

New features introduce new bugs, solved this one in v1.0.15

Oh, shoot, sorry.

No, I'm not a QA tester. I'm just thorough - or I try to be.

Thanks for the compliment, though.