phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '0a18d4c5de0eb6b4db26fcd62670bf9a' 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 ('0a18d4c5de0eb6b4db26fcd62670bf9a', -1, 1770057919, 1770057919, 'd849d817', -4, 0, 0)

Line : 187
File : sessions.php