phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a54e865027f1a73dd7b886c018d79429' 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 ('a54e865027f1a73dd7b886c018d79429', -1, 1427699136, 1427699136, '36c59fc1', -4, 0, 0)

Line : 187
File : sessions.php