diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 2cadb49..d4e9a22 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -542,6 +542,13 @@
 	else if (locals == Py_None)
 		locals = globals;
 
+	if (globals == NULL || locals == NULL) {
+		PyErr_SetString(PyExc_TypeError, 
+			"eval must be given globals and locals "
+			"when called without a frame");
+		return NULL;
+	}
+
 	if (PyDict_GetItemString(globals, "__builtins__") == NULL) {
 		if (PyDict_SetItemString(globals, "__builtins__",
 					 PyEval_GetBuiltins()) != 0)