Triple consonant in Swedish is incorrect

[ErikChHenriksson]

Summary

In Swedish, you can never have three consonants in a row.
When translating numbers to text using num2words, this sometimes happens. For instance, when translating 1000 to text.

Expected Behaviour

1000 -> ettusen

Actual Behaviour

1000 -> etttusen

The rule is basically that there should never be three consonants in a row in any word in Swedish.
It is OK to write "ett tusen" or "ettusen", but never etttusen.