A remark: A few lines above the error triggering point, I found a single
digit presented as math: \math{5}. Removing this and leaving the 5 in text
mode removes the error below it.
Could it be a bug in the distribution?

El dom, 25 feb 2024 a las 15:24, Andres Conrado Montoya (<
andresconrado@gmail.com>) escribió:

> I keep bumping into this error, I have no idea what may be causing it, in
> a statistics book with lots of math:
>
> registered function call [250]:
> ...mtx/tex/texmf-context/tex/context/base/mkxl/lxml-mms.lmt:749: attempt to
> index a nil value (local 'a2')
>
> I have checked everything. I have tried commenting out many things and the
> weird part is that it fails in a simple math expression: \math{E_{i}j}.
> Even a simple $y$ or \math{a+b} will trigger the error. However, this same
> file Im working on has many formulas before that, those work fine. I
> changed all the $...$ to \math{...} just in case, but with no success.
>
> Already tried remaking, regenerating, updating the distribution.
>
> Do you have any ideas to work this out? I don't know how to provide a MWE
> for this because it's a very big project (statistics book).
>
> I have tried 2 versions, the system-wide one, just upgraded:
> mtx-context     | ConTeXt Process Management 1.06
> mtx-context     | current version: 2024.02.22 18:31
>
> And a less recent version, attached to the project:
> mtx-context     | ConTeXt Process Management 1.05
> mtx-context     | current version: 2024.02.14 13:38
>
>
> Any help will be much appreciated.
>
> --
> Andrés Conrado Montoya
> Andi Kú
> andresconrado@gmail.com
> http://sesentaycuatro.com
> http://messier87.com
> http://chiquitico.org
> ----------------------------------------
> Los fines no justifican los medios, porque la medida verdadera de nuestro
> carácter está dada por los medios que estamos dispuestos a utilizar, no por
> los fines que proclamamos.
> ----------------------------------------
>
> “You develop an instant global consciousness, a people orientation, an
> intense dissatisfaction with the state of the world, and a compulsion to do
> something about it. From out there on the moon, international politics look
> so petty. You want to grab a politician by the scruff of the neck and drag
> him a quarter of a million miles out and say, ‘Look at that, you son of a
> bitch.’” — Apollo 14 astronaut Edgar Mitchell
>


-- 
Andrés Conrado Montoya
Andi Kú
andresconrado@gmail.com
http://sesentaycuatro.com
http://messier87.com
http://chiquitico.org
----------------------------------------
Los fines no justifican los medios, porque la medida verdadera de nuestro
carácter está dada por los medios que estamos dispuestos a utilizar, no por
los fines que proclamamos.
----------------------------------------

“You develop an instant global consciousness, a people orientation, an
intense dissatisfaction with the state of the world, and a compulsion to do
something about it. From out there on the moon, international politics look
so petty. You want to grab a politician by the scruff of the neck and drag
him a quarter of a million miles out and say, ‘Look at that, you son of a
bitch.’” — Apollo 14 astronaut Edgar Mitchell