md5sum: /usr/local/ispconfig/server/temp/.ispconfig_lock: No such file or directory, 3.0.5.4p4

Hello,

Updating the slave servers to the new version (3.0.5.4p4), on one of them, after chosing to "Reconfigure Permissions in master database" and "Reconfigure Services", right after the mysql server restart, after "Checking for tables which need an upgrade, are corrupt or were not closed cleanly..", I get this error message:

md5sum: /usr/local/ispconfig/server/temp/.ispconfig_lock: No such file or directory

After it, "Update finished." is the final line.