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Cannot edit crontab through Parallels Plesk Panel: Object not found

Parallels Plesk Panel 9.0.1 is installed.

I cannot edit existent crontab for system users through Parallels Plesk Panel.
The error below occurs when click button "OK" on page "Crontab tasks of USER" {Home -> Settings -> Scheduled Tasks -> USER -> COMMAND -> OK}.

ERROR: PleskObjectNotFoundException
Object not found: Scheduled Task #0x65b1857d55750f93f77f23e9be7307f8

Additionally, an exception has occurred while trying to report this error:
Object not found: Scheduled Task #0x65b1857d55750f93f77f23e9be7307f8

0: /usr/local/psa/admin/plib/UIPointer.php:1204
UIPointer->internalMovedTo(object of type UserAdmin)
1: /usr/local/psa/admin/plib/UIPointer.php:1256
UIPointer->movedTo(object of type UserAdmin)
2: /usr/local/psa/admin/plib/UIPointer.php:1177
UIPointer->internalMovedTo(object of type UserAdmin)
3: /usr/local/psa/admin/plib/UIPointer.php:1256
UIPointer->movedTo(object of type UserAdmin)
4: /usr/local/psa/admin/plib/UIPointer.php:1060
5: /usr/local/psa/admin/plib/UIPointer.php:548
UIPointer->access(string 'GET')
6: /usr/local/psa/admin/htdocs/plesk.php:36

The problem will be fixed in future update of Parallels Plesk Panel.

Hotfix for Parallels Plesk Panel Unix version 9.0.1 is attached.
To install it you should replace existent file $PRODUCT_ROOT_D/admin/htdocs/plesk.php with attached one and correct owner and permissions, it should be root:psaadm, 644. You may correct permissions with commands chown and chmod:

~# chown root:psaadm /usr/local/psa/admin/htdocs/plesk.php
~# chmod 644 /usr/local/psa/admin/htdocs/plesk.php

Do not forget to backup old file plesk.php.

IMPORTANT: Do not modify the script. Corrupted script may cause inaccessibility of Parallels Plesk Panel. After the script is installed verify it has correct md5 sum.

Check md5 sum with command md5sum on RedHat-like operating systems, Debian or Ubuntu and md5 on FreeBSD.

~# md5sum plesk.php
abd47c8d446669d0ee72e9a4373454bf plesk.php

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