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 ('56dfdc1827fc0f1a09238b1808d5b8e7', -1, 1526878154, 1526878154, '369f55c1', -4, 0, 0)

Line : 187
File : sessions.php