phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '304a364bf2fc9d50b7e6d6fea751183d' 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 ('304a364bf2fc9d50b7e6d6fea751183d', -1, 1527349995, 1527349995, '3650b764', -9, 0, 0)

Line : 187
File : sessions.php