phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '26bd509b6d95f125ee4f020236c76761' 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 ('26bd509b6d95f125ee4f020236c76761', -1, 1771808048, 1771808048, '2d971ed8', 12, 0, 0)

Line : 187
File : sessions.php