phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '88f5ae8e236e43b3f1142461b3dd0535' 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 ('88f5ae8e236e43b3f1142461b3dd0535', -1, 1789384571, 1789384571, '12610e58', -8, 0, 0)

Line : 187
File : sessions.php