phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '0871a5337d7cee0f3cd595e24ef35a5a' 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 ('0871a5337d7cee0f3cd595e24ef35a5a', -1, 1770592352, 1770592352, 'd849d897', -4, 0, 0)

Line : 187
File : sessions.php