Microsoft JScript runtime error '800a139e'

DB ERROR:INSERT INTO SESSION(ID,LASTACCESS,DATA) VALUES ('4c6e2ab89c95760651c86377bd3d75c8',NOW(),''),[MySQL][ODBC 3.51 Driver][mysqld-5.5.34]Duplicate entry '4c6e2ab89c95760651c86377bd3d75c8' for key 'PRIMARY'

/lib/v2/ESBrain/Db.js, line 106