phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '51646e19d6820656b5b3b19ea89c96ed' 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 ('51646e19d6820656b5b3b19ea89c96ed', -1, 1767039045, 1767039045, 'c0a8100c', 1, 0, 0)

Line : 187
File : sessions.php