phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : -1 ERROR: duplicate key value violates unique constraint "phpbb_session_pkey" DETAIL: Key (session_id)=(9511ffe4c9653b3040f8fd9150cd78f6) already exists.

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('9511ffe4c9653b3040f8fd9150cd78f6', -1, 1714246610, 1714246610, '12e0f6cb', 53, 0, 0)

Line : 187
File : sessions.php