It is not really an error that forms a viable gamete or seed, it is the errors that form unviable gametes or seeds.
In that, it is not errors, but the pattern of chromosomes that are distributed into the gametes, that cannot match up to normal pollen or seed from another plant.
The triploid has 3 sets of chromosomes 3N, when they are divided into gametes 1N, the set of chromosomes is most often wrong, and can't match up with another gamete. Only rarely is a correct full set distributed to give viable gametes. Plants can also make viable offspring with 2N, 3N, 4N, possibly more, and possibly 1N, haploid.
There are also rare similar cases where mules ( horse donkey hybrid ) have produced a viable gamete and then a foal.
Tahiti / Persian Lime have been grown out a couple of times from large seed collections from factory lime pulp, and the progeny described.
Will try to find the link to the article.