Arg out of range error when tagging on the search view

[Kototama]

Hello,

I'm using notmuch with the git id db5189a3b9194da55e5c311ef3fc50a72c8a7009

When typing M-: and executing (notmuch-search-tag "-unread") on the
search view, I get the following error in *Messages*:

help-function-arglist: End of file during parsing

Any idea?

Pierre