Microsoft JScript runtime error '800a139e'

DB ERROR:INSERT INTO SESSION(ID,LASTACCESS,DATA) VALUES ('1dc52ca9d1f1724ecf16f45286e7c36f',NOW(),''),[MySQL][ODBC 3.51 Driver][mysqld-5.5.34]Duplicate entry '1dc52ca9d1f1724ecf16f45286e7c36f' for key 'PRIMARY'

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