phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'cd0ef307136120e7b53f34d411cc4c11' 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 ('cd0ef307136120e7b53f34d411cc4c11', -1, 1490300185, 1490300185, '36ccfc25', 9, 0, 0)

Line : 187
File : sessions.php