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 ('9931cdaac8f98d3eeecbbe41c2e02d4e', -1, 1511588388, 1511588388, '36e0661a', -2, 0, 0)

Line : 189
File : sessions.php