Limit values that lead to an error.

[kaiwas]

Limit values that lead to an error.

[maxwxyz]

not sure if this is possible as all values would need to be calculated.

[kaiwas]

Yes. I also think that this is not an easy task.
some kind of buffer may be required. into which the “previous/correct” data is entered. And if the task ends with a breakdown and an error, then a “rollback” is made to these values. (this is one of the possible options).
Now everything is just silently breaking down.
You can try to track the cause in the console. But in my opinion, the average user is not required to know that the console exists

[kaiwas]

Add to the collection of examples where what is discussed in this topic would be useful.
https://forum.freecad.org/viewtopic.php?p=758678
At a certain value, the segment in the sketch becomes zero length and everything breaks.

[kaiwas]

a simple idea emerged. Which will not be difficult to implement.
When a small, barely noticeable icon with an exclamation mark lights up in the view tree, the program takes a step back (Undo / AutoCtrl+Z) and displays a message that "the “object OBJECTNAME ” is broken. Repeat the operation with other values". In This case, the object itself is highlighted in red.