diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
index dd94590..61d86a1 100644
--- a/Lib/test/test_traceback.py
+++ b/Lib/test/test_traceback.py
@@ -1001,6 +1001,10 @@ def test_lazy_lines(self):
             '"""Test cases for traceback module"""',
             f.line)
 
+    def test_no_line(self):
+        f = traceback.FrameSummary("f", None, "dummy")
+        self.assertEqual(f.line, None)
+
     def test_explicit_line(self):
         f = traceback.FrameSummary("f", 1, "dummy", line="line")
         self.assertEqual("line", f.line)