[horde] Facebook stopped working after update, error messages in server log...

[Mehmet Giritli]

I updated my php to 5.4 from 5.3 and I think I also updated some
packages of horde with the usual upgrade command:

/var/www/horde4/pear/pear -c /var/www/horde4/pear.conf upgrade-all -B

I don't remember which packages they are however :-/ 

After that, my facebook stream is always empty. I find these error
messages in the server logs:

14/Jan/2013:15:28:19 EET WARN: HORDE [horde] PHP ERROR: array_pop()
expects parameter 1 to be array, null given [pid 14423 on line 141 of
"/var/www/horde4/lib/Block/FbStream.php"]
14/Jan/2013:15:28:19 EET NOTICE: HORDE [horde] PHP ERROR: Undefined
index: pic_square_with_logo [pid 14423 on line 149 of
"/var/www/horde4/lib/Block/FbStream.php"]
14/Jan/2013:15:28:21 EET WARN: HORDE [timeobjects] PHP ERROR: Invalid
argument supplied for foreach() [pid 14423 on line 69 of
"/var/www/horde4/pear/php/Horde/Service/Facebook/Events.php"]
14/Jan/2013:15:28:21 EET WARN: HORDE [timeobjects] PHP ERROR: Invalid
argument supplied for foreach() [pid 14423 on line 76 of
"/var/www/horde4/pear/php/Horde/Service/Facebook/Events.php"]
14/Jan/2013:15:28:21 EET WARN: HORDE [timeobjects] PHP ERROR: Invalid
argument supplied for foreach() [pid 14423 on line 54 of
"/var/www/horde4/timeobjects/lib/Driver/FacebookEvents.php"]
14/Jan/2013:15:28:31 EET WARN: HORDE [horde] PHP ERROR: Invalid argument
supplied for foreach() [pid 14423 on line 94 of
"/var/www/horde4/services/facebook/index.php"]
14/Jan/2013:15:28:31 EET WARN: HORDE [horde] PHP ERROR: Invalid argument
supplied for foreach() [pid 14423 on line 100 of
"/var/www/horde4/services/facebook/index.php"]

Any help would be highly appreciated. Is this because I updates some
horde packages or because I updated to php-5.4?