phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '29ed51c2317ba22369ff6c38baf78f15' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('29ed51c2317ba22369ff6c38baf78f15', -1, 1397674924, 1397674924, '321390f3', 23, 0, 0)

Line : 187
File : sessions.php