phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '2606f54c6d1e0253a1998b68c99e091a' 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 ('2606f54c6d1e0253a1998b68c99e091a', -1, 1414036171, 1414036171, '3652a62d', 4, 0, 0)

Line : 187
File : sessions.php