diff --git a/database.py b/database.py
index a851884..a0ec6bc 100644
--- a/database.py
+++ b/database.py
@@ -23,7 +23,7 @@ class Database(object):
                 SELECT student_id, name, MAX(grade)
                 FROM students INNER JOIN tests
                 ON students.number=tests.student_id
-                WHERE test_id==?
+                WHERE test_id==? AND student_id!=0
                 GROUP BY student_id
                 ORDER BY grade DESC;'''
             return c.execute(cmd, [test_id]).fetchall()
--
libgit2 0.21.2