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)=(dc8b850f69603db324c508b0e2ad0221) 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 ('dc8b850f69603db324c508b0e2ad0221', -1, 1579811008, 1579811008, '035320ab', -1, 0, 0)

Line : 187
File : sessions.php