[horde] CalDAV synchronize errors and Redis error

[Ruud Baart]

After the latest updates of H6 I can't synchronize tasks or agenda. 
Probably because of error in redis. These are the errors logged:

Synchronize errors:

    026/06/11 09:06:27 [error] 680112#680112: *12 readv() failed (104: Connection reset by peer) while reading upstream, client: 37.66.54.147, server: aa.bb.cc, request: "PROPFIND /horde/rpc/calendars/user%40domain.com/tasks~Z1H0u8DzYMq3V0_B3t6AGY4/ HTTP/2.0", upstream: "fastcgi://unix:/run/php/php8.4-fpm.sock:", host: "aa.bb.cc"
    2026/06/11 09:06:49 [error] 680112#680112: *12 readv() failed (104: Connection reset by peer) while reading upstream, client: 37.66.54.147, server: aa.bb.cc, request: "PROPFIND /horde/rpc/calendars/user%40domain.com/calendar~gLuI9IBq20HJjwKbcMgP4xZ/ HTTP/2.0", upstream: "fastcgi://unix:/run/php/php8.4-fpm.sock:", host: "aa.bb.cc"


Redis error:

    HORDE 2026-06-11T07:08:12+00:00 emergency: TypeError: Horde\HashTable\Driver\Redis::get(): Argument #1 ($key) must be of type string, array given, called in /home/websites/aa.bb.cc/horde/vendor/horde/cache/lib/Horde/Cache/Storage/Hashtable.php on line 69 and defined in /home/websites/aa.bb.cc/horde/vendor/horde/hashtable/src/Driver/Redis.php:82
    Stack trace:
    #0 /home/websites/aa.bb.cc/horde/vendor/horde/cache/lib/Horde/Cache/Storage/Hashtable.php(69): Horde\HashTable\Driver\Redis->get()
    #1 /home/websites/aa.bb.cc/horde/vendor/horde/cache/lib/Horde/Cache.php(113): Horde_Cache_Storage_Hashtable->get()
    #2 /home/websites/aa.bb.cc/horde/vendor/horde/cache/lib/Horde/Cache/Storage/Stack.php(65): Horde_Cache->get()
    #3 /home/websites/aa.bb.cc/horde/vendor/horde/cache/lib/Horde/Cache.php(113): Horde_Cache_Storage_Stack->get()
    #4 /home/websites/aa.bb.cc/horde/vendor/horde/perms/lib/Horde/Perms/Sql.php(315): Horde_Cache->get()
    #5 /home/websites/aa.bb.cc/horde/vendor/horde/core/lib/Horde/Registry.php(1853): Horde_Perms_Sql->exists()
    #6 /home/websites/aa.bb.cc/horde/vendor/horde/core/lib/Horde/Registry.php(980): Horde_Registry->hasPermission()
    #7 /home/websites/aa.bb.cc/horde/vendor/horde/core/lib/Horde/Core/Notification/Handler.php(101): Horde_Registry->listApps()
    #8 /home/websites/aa.bb.cc/horde/vendor/horde/core/lib/Horde/Registry.php(644): Horde_Core_Notification_Handler->attachAllAppHandlers()
    #9 /home/websites/aa.bb.cc/horde/vendor/horde/core/lib/Horde/Registry.php(390): Horde_Registry->__construct()
    #10 /home/websites/aa.bb.cc/horde/vendor/horde/horde/index.php(20): Horde_Registry::appInit()
    #11 /home/websites/aa.bb.cc/horde/web/horde/index.php(3): require_once('...')
    #12 /home/websites/aa.bb.cc/horde/web/index.php(3): require_once('...')
    #13 {main} [pid 680158 on line 509 of "/home/websites/aa.bb.cc/horde/vendor/horde/imp/lib/Application.php"]

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Cordialement,

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R.J. Baart
Portable: +33 7 88398245

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