Preventing page break in register between reference and page number (ConTeXt)

Problem: The page number of an reference in the register is set to th next page - pake breaking between the reference and the page number.

I do not know how to produce a smaller Example:

\definepapersize[MyBook][A6]
\setuppapersize[MyBook][A6] % Prints on paper the size of MyBook

\starttext
\index{A} blub
\index{B} blub
\index{C} blub
\index{D} blub
\index{E} blub
\index{F} blub
\index{G} blub
\index{H} blub
\index{I} blub
\index{J} blub
\index{K} blub
\index{Long Long Long} blub
\index{M} blub
\index{N} blub

\completeindex
\stoptext


The page numer of the reference "Long Long Long" is set to the next page. How to prevent this?

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I don't know if you can still use this answer or if there have been comments that solved your problem before. But I am putting this here to lessen the number of unanswered questions. Well, I am new to Context but for your problem, you can consider shortening the distance between index entry and the page number using

\setupregister[index][balance=yes,distance=6pt]


Here is the full code:

\definepapersize[MyBook][A6]
\setuppapersize[MyBook][A6] % Prints on paper the size of MyBook
\setupregister[index][distance=6pt]

\starttext
\index{A} blub
\index{B} blub
\index{C} blub
\index{D} blub
\index{E} blub
\index{F} blub
\index{G} blub
\index{H} blub
\index{I} blub
\index{J} blub
\index{K} blub
\index{Long Long Long} blub
\index{M} blub
\index{N} blub

\completeindex
\stoptext

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