phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '26f7b6cb1ee88b793b6d97edfd4b7b7d' 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 ('26f7b6cb1ee88b793b6d97edfd4b7b7d', -1, 1770501152, 1770501152, 'd849d88e', -9, 0, 0)

Line : 187
File : sessions.php