user_script:2: attempt to concatenate local 'key' (a userdata value)

[fprochazka]

[2013-08-19 00-47-46] Kdyby\Redis\RedisClientException: 
Failed to successfully execute lua script journal. write(52269f3d9677595df378c6fbe2e4a8b3): 
ERR Error running script (call to f_3ccea2cb2eb0750385a970f54c13ceee756d6369): 
user_script:2: attempt to concatenate local 'key' (a userdata value) 
in /vendor/kdyby/redis/src/Kdyby/Redis/RedisLuaJournal.php:79

[bazo]

this also happens in 2015

[2015-12-02 17-21-11] Kdyby\Redis\RedisClientException: 
Failed to successfully execute lua script journal.clean(): 
ERR Error running script (call to f_6856c0c21774816e0b32b8b28dcc99cf33673b71): 
@user_script:2: user_script:2: attempt to concatenate local 'key' (a table value)  
in /var/www/micropage/releases/20151125180556/vendor/kdyby/redis/src/Kdyby/Redis/RedisLuaJournal.php:54

[fprochazka]

I fear this requires some lua experience. Beeing able to code in lua and debug weird problems are two different skills.