Issue in getting the s_core_config_mails getting updated automatically

We have an issue with the DB field „context“ of the table "s_core_config_mails " getting updated automatically for the name value „sREGISTERCONFIRMATION“.
Since the serialized object in „context“ field is wrong, we are not able to access the Email management page and when the customer registration mail is sent, we are getting the below error.

{
„exception“: „Could not convert database value "a:22:{s:5:"sMAIL";s:…" to Doctrine Type array“
}

Can you please let us know what could be the issue here?