phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c26d3b5ea3456c7de8d44fde40045774' for key 'PRIMARY'

INSERT INTO phpbb_korea_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c26d3b5ea3456c7de8d44fde40045774', -1, 1417109853, 1417109853, '17143d55', 8, 0, 0)

Line : 305
File : sessions.php