AD sync failing with parameter exception error.

Hi Team,

AD sync is continuously failing with error,

ErrorMessages (2022-05-12 11:56:52.830) [2134003] Error executing synchronization.
[1777018] Error executing synchronization project (Active Directory Domain (DC=***,DC=INT))'s workflow (Active Directory - Synchronisation).
[1777124] Error executing projection step (Group Outbound) of projection configuration (Active Directory - Synchronisation (Copy of Initial Synchronization)).
[1777219] Error executing synchronization step (Group Outbound)!
[1777004] Method (Update object (Update)) could not be executed successfully.
[System.ArgumentNullException] Value cannot be null.
Parameter name: exception

When I open the log from sync editor almost all the error messages are filled with above error message.

How can we fix this error message?