phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c1d5a1d5e3fd19d2e66b2f6042b7998a' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c1d5a1d5e3fd19d2e66b2f6042b7998a', -1, 1770087215, 1770087215, 'c0a8100b', -9, 0, 0)

Line : 187
File : sessions.php