phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b6e50b0cce6ed6b5fd80f89c9699d12a' 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 ('b6e50b0cce6ed6b5fd80f89c9699d12a', -1, 1770383366, 1770383366, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php