phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f5a674988c7a53f3bc8eedd2632c5e12' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('f5a674988c7a53f3bc8eedd2632c5e12', -1, 1770244246, 1770244246, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php