phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '3e124f61e71009841c9b3f6307b64894' 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 ('3e124f61e71009841c9b3f6307b64894', -1, 1406168435, 1406168435, '36e3b6bf', 55, 0, 0)

Line : 187
File : sessions.php