diff -r 19e199038704 Lib/pdb.py
--- a/Lib/pdb.py	Tue Oct 25 15:38:28 2016 +0300
+++ b/Lib/pdb.py	Tue Oct 25 14:07:06 2016 +0100
@@ -748,7 +748,10 @@
         """
         # this method should be callable before starting debugging, so default
         # to "no globals" if there is no current frame
-        globs = self.curframe.f_globals if hasattr(self, 'curframe') else None
+        globs = None
+        if getattr(self, 'curframe', None) is not None:
+            globs = self.curframe.f_globals
+
         line = linecache.getline(filename, lineno, globs)
         if not line:
             self.message('End of file')
diff -r 19e199038704 Lib/test/test_pdb.py
--- a/Lib/test/test_pdb.py	Tue Oct 25 15:38:28 2016 +0300
+++ b/Lib/test/test_pdb.py	Tue Oct 25 14:07:06 2016 +0100
@@ -1110,6 +1110,16 @@
             if save_home is not None:
                 os.environ['HOME'] = save_home
 
+    def test_reset_checkline(self):
+        # Ensure that checkline() can be called after reset()
+        with open(support.TESTFN, 'w') as f:
+            f.write("print(123)")
+
+        deb = pdb.Pdb()
+        self.assertEqual(deb.checkline(support.TESTFN, 1), 1)
+        deb.reset()
+        self.assertEqual(deb.checkline(support.TESTFN, 1), 1)
+
     def tearDown(self):
         support.unlink(support.TESTFN)