how to remove unwanted clef before line break?

[Bodo Maass]

Hi,

I want a new line to start with a different clef. However, I always get a second copy of the new clef on the old line, just before the line break. I have simplified it to this example:

---- start 
test.ly --------
\version "2.11.10"

{
\time 2/4
{
 \clef treble  c' d' e' f'  \bar "||" \break
 \clef bass c d e f  \bar "||"
 }
}
----- end 
test.ly ------

This will generate a pdf with two lines. The first line has a treble clef and a few notes.Just before the page break, the first line contains a bass clef at the end. The second line starts with the bass clef, as intended.

How can I remove the extra bass clef at the end of the first line?

Any help would be appreciated.

Thanks,
 Bodo