phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b5c19a38fe70b01b7545ae6b25620104' for key 1

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('b5c19a38fe70b01b7545ae6b25620104', -1, 1498646424, 1498646424, '36c6a37c', 15, 0, 0)

Line : 187
File : sessions.php