Quoting Joey.
no variable has ever been double defined, that's not possible at all.
Only last week or so, a past slice of this (self) used a compiler, which complained about a double definition.
While user Joey may exist in another universe where unforgivable generalities run rampant, and chaos reins with confusion at its side, perhaps a reference to a specific term like 'scope', 'field', 'member', should be assumed there somewhere.

Ah, locales, languages and translations, but if the source is human, nothing is lost in the transfer.
@sydan
This (self) does not assume that the help bar, it's contents, and SED are directly linked to the engine in such a critical way.
Although the engine may be riddled with a number of nuisances, many may be somewhat out of sight, so for the time being, maybe you could just ignore the help bar, until the source of the crash is found, a better engine is selected, or some more worthwhile task preempts.
Quoting sydan.
I guess no one actually knows how to solve this problem
Is that really 'your' best guess?
If the solution involves modifying the code there, and other parties have limited access to relevant information, maybe, in that case, replacing the term 'no one' with 'sydan', yields sense (or an approximation thereof for this senseless realm).
After so many occurrences, we're going to have to assume Quadraxas is doing 'that' on purpose.
this.reputation = -255;
this.that[n].reputation -= 55;