[horde] wicked 2.0.1: error while saving page

[Andreas Schulze]

Hello,

I get the following error when saving the page "Wiki/Home" for the  
*second time*:

2014-03-25T21:53:30+01:00 ERR: HORDE [wicked] SQL QUERY FAILED:  
SQLSTATE[23000]: Integrity constraint violation: 19 column page_name  
is not unique
         INSERT INTO wicked_pages (page_name, page_text, version_created,
           page_version, page_hits, change_author) VALUES ('Wiki/Home', '+
           foo bar.',
           1395780810, 1, 0, 'wikiuser') [pid 13197 on line 200 of  
"/usr/share/php/Horde/Db/Adapter/Pdo/Base.php"]
2014-03-25T21:53:30+01:00 EMERG: HORDE [wicked] SQLSTATE[23000]:  
Integrity constraint violation: 19 column page_name is not unique [pid  
13197 on line 621 of "/horde/wicked/lib/Driver/Sql.php"]

The first time I have changed the default page without error.

I use horde 5.1.6 and wicked 2.0.1.

# horde-db-migrate wicked
[  INFO  ] Migrating DB up.
[  INFO  ] Current wicked schema version: 6
[  INFO  ] Ending wicked schema version: 6

the database is sqlite, (sqlite3-3.7.13)

I think I saw this error months ago but I can't find something in my  
list archive.
Any hints?