phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '778dfe2ce8831de535cbb7234f36e751' 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 ('778dfe2ce8831de535cbb7234f36e751', -1, 1765540197, 1765540197, 'd849d836', -4, 0, 0)

Line : 187
File : sessions.php