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")=(7dcc463aa851e4ad17a2b395b54d977b) 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 ('7dcc463aa851e4ad17a2b395b54d977b', -1, 1784691618, 1784691618, 'd849d8fc', -9, 0, 0)

Line : 187
File : sessions.php