phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c5254f9de182c63d6344ebb69f286b2c' 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 ('c5254f9de182c63d6344ebb69f286b2c', -1, 1422808633, 1422808633, '36a78a35', 4, 0, 0)

Line : 216
File : sessions.php