phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1114 The table 'phpbb_sessions' is full

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('f81e91c0b5d900eba3ad56468e9a0d5c', -1, 1503434309, 1503434309, '36c6b9c3', -4, 0, 0)

Line : 189
File : sessions.php