Unserialize warnings in logs

Hi,
we use OMP 3.1.1-4 and we have unserialize warnings in the logs.
We noticed them during a permission issue we solved, but they are still there.
Regarding the serialize() configuraton, we didn’t change anything on purpose, we just applied this patch, but we did that on the test environment and file uploading is working here…
It’s only a PHP Notice, but we would like if is safe to ignore it or not.

Finally, Below is our i18N config, we don’t see problems there.
Best regards,
Stefano

;;;;;;;;;;;;;;;;;;;;;;;;;
; Localization Settings ;
;;;;;;;;;;;;;;;;;;;;;;;;;

[i18n]

; Default locale
locale = en_US

; Client output/input character set
client_charset = utf-8

; Database connection character set
; Must be set to “Off” if not supported by the database server
; If enabled, must be the same character set as “client_charset”
; (although the actual name may differ slightly depending on the server)
connection_charset = utf8

; Database storage character set
; Must be set to “Off” if not supported by the database server
database_charset = utf8