Can't add a new contact

On adding a new contact using the contact form or importing records I get the following MySQL error

Sorry. A non-recoverable error has occurred.

Database Error Code: Field 'hash' doesn't have a default value, 1364

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error

Array
(
[callback] => Array
(
[0] => CRM_Core_Error
[1] => handle
)

[code] => -1
[message] => DB Error: unknown error
[mode] => 16
[debug_info] => INSERT INTO civicrm_contact (domain_id , contact_type , sort_name , display_name , nick_name , home_URL , preferred_communication_method , do_not_phone , do_not_email , do_not_mail , do_not_trade ) VALUES ( 1 , 'Organization' , 'Revell and Janes' , 'Revell and Janes' , NULL , NULL , NULL , 0 , 1 , 1 , 0 ) [nativecode=1364 ** Field 'hash' doesn't have a default value]
[type] => DB_Error
[user_info] => INSERT INTO civicrm_contact (domain_id , contact_type , sort_name , display_name , nick_name , home_URL , preferred_communication_method , do_not_phone , do_not_email , do_not_mail , do_not_trade ) VALUES ( 1 , 'Organization' , 'Revell and Janes' , 'Revell and Janes' , NULL , NULL , NULL , 0 , 1 , 1 , 0 ) [nativecode=1364 ** Field 'hash' doesn't have a default value]
[to_string] => [db_error: message="DB Error: unknown error" code=-1 mode=callback callback=CRM_Core_Error::handle prefix="" info="INSERT INTO civicrm_contact (domain_id , contact_type , sort_name , display_name , nick_name , home_URL , preferred_communication_method , do_not_phone , do_not_email , do_not_mail , do_not_trade ) VALUES ( 1 , 'Organization' , 'Revell and Janes' , 'Revell and Janes' , NULL , NULL , NULL , 0 , 1 , 1 , 0 ) [nativecode=1364 ** Field 'hash' doesn't have a default value]"]
)

Apache/2.2.2 (Win32) PHP/5.1.4 MySQL 5.0.22

The field value for 'hash' is not included in the values list and is set to 'Non Null' with no default value.

Bob