phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '7a976df7e4ed0c59e48aec4b2e10fbe1' 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 ('7a976df7e4ed0c59e48aec4b2e10fbe1', -1, 1501029591, 1501029591, '904c3849', 7, 0, 0)

Line : 199
File : sessions.php