diff --git a/Misc/NEWS.d/next/Core and Builtins/2017-09-04-09-51-53.bpo-31337.CSt-e_.rst b/Misc/NEWS.d/next/Core and Builtins/2017-09-04-09-51-53.bpo-31337.CSt-e_.rst
new file mode 100644
index 000000000000000..54564b8b3a6e95f
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2017-09-04-09-51-53.bpo-31337.CSt-e_.rst	
@@ -0,0 +1,2 @@
+Close a minor NULL dereference opportunity in compile.c.  Found by Kirit
+Sankar Gupta.
diff --git a/Python/compile.c b/Python/compile.c
index e547c2fd591c498..c6f5333c64ad275 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -3360,6 +3360,11 @@ compiler_subdict(struct compiler *c, expr_ty e, Py_ssize_t begin, Py_ssize_t end
         }
         for (i = begin; i < end; i++) {
             key = get_const_value((expr_ty)asdl_seq_GET(e->v.Dict.keys, i));
+            if (key == NULL) {
+                Py_DECREF(keys);
+                PyErr_BadInternalCall();
+                return 0;
+            }
             Py_INCREF(key);
             PyTuple_SET_ITEM(keys, i - begin, key);
         }