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Nightly errors logged in panel.log - "Struct keys must be all strings"

Christopher McBride

Basic Pleskian
TITLE:
Nightly errors logged in panel.log - "Struct keys must be all strings"
PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE:
OS ‪CentOS 6.10 (Final)‬
Product Plesk Onyx
Version 17.0.17 Update #55
PROBLEM DESCRIPTION:
I'm receiving nightly errors in my panel.log as follows.

There are no other lines before or after to explain what it is referring to, or where it is coming from. I suspect WP Toolkit?

[2018-09-01 03:26:59] ERR [1] error: Struct keys must be all strings
[2018-09-01 03:46:42] ERR [1] error: Struct keys must be all strings
[2018-09-02 03:45:57] ERR [1] error: Struct keys must be all strings
[2018-09-02 04:05:03] ERR [1] error: Struct keys must be all strings
[2018-09-03 03:51:55] ERR [1] error: Struct keys must be all strings
[2018-09-03 04:11:12] ERR [1] error: Struct keys must be all strings
[2018-09-04 03:43:27] ERR [1] error: Struct keys must be all strings
[2018-09-04 04:04:09] ERR [1] error: Struct keys must be all strings
[2018-09-05 03:27:04] ERR [1] error: Struct keys must be all strings
[2018-09-05 03:48:26] ERR [1] error: Struct keys must be all strings​
STEPS TO REPRODUCE:
Happens automatically each night​
ACTUAL RESULT:
Above errors logged​
EXPECTED RESULT:
No errors​
ANY ADDITIONAL INFORMATION:
YOUR EXPECTATIONS FROM PLESK SERVICE TEAM:
Help with sorting out
 
Looks like the issue is related to Mysql. I would suggest you try to repair Plesk database with:

# plesk repair db
# plesk repair installation
 
This is happening on two separate servers - one of which had the above commands run last week due to a MU causing a corrupt mysql.user table.

Any other suggestions?
 
Thanks - my licence is via a third party hosting company, so I cannot contact Plesk Support Team directly.

I'll try to raise a ticket at my side.
 
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