bug#22135: 24.3; "hangul is undefined" in minibuffer terminates isearch

[Eli Zaretskii]

> Date: Wed, 9 Dec 2015 22:36:17 -0500 (EST)
> From: "dto xelf.me" <dto@xelf.me>
> 
> When doing the C-s interactive search and typing the search text in the
> minibuffer, pressing spacebar causes the isearch input to terminate with
> the message "<Hangul> is undefined" and I have to restart the
> search. The search term when restarting, now includes the space and i
> can continue searching for things with spaces in them, however having to
> restart the isearch every time has become a nightmare. But this suggests
> that the space is being entered into the search text successfully,
> before the Hangul error. (See the Recent Input below for it showing SPC
> then <Hangul>.) I don't have a hangul key as this is a standard USA
> keyboard.

What does "C-h l" show after such an incident?