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 ('a4a78f8cf670fd08f3e44f44145e6965', -1, 1508646758, 1508646758, '171456b1', -8, 0, 0)

Line : 187
File : sessions.php