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 ('b5932cd4dbd0e58761cf70c8ceb9afad', -1, 1508680453, 1508680453, '36a6f50a', 15, 0, 0)

Line : 187
File : sessions.php