diff --git a/src/if_py_both.h b/src/if_py_both.h
index 6ea0afff628ef786ef0f3703f2f86cd0f2ce21e8..748577981c71d75e48ec2348e581edb7d482f8c8 100644
--- a/src/if_py_both.h
+++ b/src/if_py_both.h
@@ -1624,6 +1624,9 @@ DictionaryContains(DictionaryObject *self, PyObject *keyObject)
     PyObject	*rObj = _DictionaryItem(self, keyObject, DICT_FLAG_RETURN_BOOL);
     int		ret;
 
+    if (rObj == NULL)
+	return -1;
+
     ret = (rObj == Py_True);
 
     Py_DECREF(rObj);
diff --git a/src/testdir/test86.in b/src/testdir/test86.in
index ba3557be30303d64396a3a0fac4a044c60ee3edc..48fa4e5a1dd26dae32ef0f1dafebd0a5e3467807 100644
--- a/src/testdir/test86.in
+++ b/src/testdir/test86.in
@@ -1088,6 +1088,9 @@ ee('d.get("a", 2, 3)')
 stringtochars_test('d.get(%s)')
 ee('d.pop("a")')
 ee('dl.pop("a")')
+cb.append(">> DictionaryContains")
+ee('"" in d')
+ee('0 in d')
 cb.append(">> DictionaryIterNext")
 ee('for i in ned: ned["a"] = 1')
 del i
diff --git a/src/testdir/test86.ok b/src/testdir/test86.ok
index c8517b3dcdd2237d3f8693671fb7cdb7888ddf24..69c98d02d3a6375f5016521459c97226dd6ac094 100644
--- a/src/testdir/test86.ok
+++ b/src/testdir/test86.ok
@@ -516,6 +516,9 @@ d.get("\0"):TypeError:('expected string without null bytes',)
 <<< Finished
 d.pop("a"):KeyError:('a',)
 dl.pop("a"):error:('dictionary is locked',)
+>> DictionaryContains
+"" in d:ValueError:('empty keys are not allowed',)
+0 in d:TypeError:('expected str() or unicode() instance, but got int',)
 >> DictionaryIterNext
 for i in ned: ned["a"] = 1:RuntimeError:('hashtab changed during iteration',)
 >> DictionaryAssItem
diff --git a/src/testdir/test87.in b/src/testdir/test87.in
index 0ee6df3b2a3b36d3162b711642466d5e851bfcc8..54cd97748fe3a2079bdbf66b23ccb5cdb9b88ca8 100644
--- a/src/testdir/test87.in
+++ b/src/testdir/test87.in
@@ -1039,6 +1039,9 @@ ee('d.get("a", 2, 3)')
 stringtochars_test('d.get(%s)')
 ee('d.pop("a")')
 ee('dl.pop("a")')
+cb.append(">> DictionaryContains")
+ee('"" in d')
+ee('0 in d')
 cb.append(">> DictionaryIterNext")
 ee('for i in ned: ned["a"] = 1')
 del i
diff --git a/src/testdir/test87.ok b/src/testdir/test87.ok
index 9a2d686cd923a57b2a1c386904dd38b72ac8e718..eed179c5a9e21b956ed635819e32cf89ec42029e 100644
--- a/src/testdir/test87.ok
+++ b/src/testdir/test87.ok
@@ -505,6 +505,9 @@ d.get("\0"):(<class 'TypeError'>, TypeError('expected bytes with no null',))
 <<< Finished
 d.pop("a"):(<class 'KeyError'>, KeyError('a',))
 dl.pop("a"):(<class 'vim.error'>, error('dictionary is locked',))
+>> DictionaryContains
+"" in d:(<class 'ValueError'>, ValueError('empty keys are not allowed',))
+0 in d:(<class 'TypeError'>, TypeError('expected bytes() or str() instance, but got int',))
 >> DictionaryIterNext
 for i in ned: ned["a"] = 1:(<class 'RuntimeError'>, RuntimeError('hashtab changed during iteration',))
 >> DictionaryAssItem
diff --git a/src/version.c b/src/version.c
index 229672a30b72fd10a67389790c24c5c0769687e1..b46d791b45807544bb8c957a793a6122ea6cb307 100644
--- a/src/version.c
+++ b/src/version.c
@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    63,
 /**/
     62,
 /**/