oscommerce error

The error below comes up on each page of our oscommerce site. We need someone to repair this error and tell us how it was repaired to avoid it happening again in the future.

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1062 - Duplicate entry '87a3c18aae3dbed75130301cf8c7eb5d' for key 1

insert into sessions values ('87a3c18aae3dbed75130301cf8c7eb5d?info_id=7?info_id=7?info_id=7?info_id=7?info_id=7', '1145027007', 'cart|O:12:"shoppingcart":4:{s:8:"contents";a:0:{}s:5:"total";i:0;s:6:"weight";i:0;s:12:"content_type";b:0;}language|s:7:"english";languages_id|s:1:"1";currency|s:3:"USD";navigation|O:17:"navigationhistory":2:{s:4:"path";a:1:{i:0;a:4:{s:4:"page";s:9:"index.php";s:4:"mode";s:3:"SSL";s:3:"get";a:0:{}s:4:"post";a:0:{}}}s:8:"snapshot";a:0:{}}affiliate_ref|N;affiliate_clickthroughs_id|N;')

[TEP STOP]

1062 - Duplicate entry '87a3c18aae3dbed75130301cf8c7eb5d' for key 1

insert into sessions values ('87a3c18aae3dbed75130301cf8c7eb5d?info_id=7?info_id=7?info_id=7?info_id=7?info_id=7', '1145027007', 'cart|O:12:"shoppingcart":4:{s:8:"contents";a:0:{}s:5:"total";i:0;s:6:"weight";i:0;s:12:"content_type";b:0;}language|s:7:"english";languages_id|s:1:"1";currency|s:3:"USD";navigation|O:17:"navigationhistory":2:{s:4:"path";a:1:{i:0;a:4:{s:4:"page";s:9:"index.php";s:4:"mode";s:3:"SSL";s:3:"get";a:0:{}s:4:"post";a:0:{}}}s:8:"snapshot";a:0:{}}affiliate_ref|N;affiliate_clickthroughs_id|N;')

[TEP STOP]

Warning: Unknown(): A session is active. You cannot change the session module's ini settings at this time. in Unknown on line 0

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