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 ('d8c6eaa6ba8ce3318648a1fcc5339fb0', -1, 1506054944, 1506054944, '36c6a54a', -4, 0, 0)

Line : 187
File : sessions.php