phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b1a0ecdfb289a3b4ec1444cf13ba99d2' 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 ('b1a0ecdfb289a3b4ec1444cf13ba99d2', -1, 1768575617, 1768575617, 'd849d834', -4, 0, 0)

Line : 187
File : sessions.php