1 files changed, 5 insertions, 1 deletions
diff --git a/Modules/_winapi.c b/Modules/_winapi.c
index a81ccaf..00a26d51 100644
--- a/Modules/_winapi.c
+++ b/Modules/_winapi.c
@@ -723,9 +723,13 @@ getenvironment(PyObject* environment)
     }
 
     keys = PyMapping_Keys(environment);
+    if (!keys) {
+        return NULL;
+    }
     values = PyMapping_Values(environment);
-    if (!keys || !values)
+    if (!values) {
         goto error;
+    }
 
     envsize = PySequence_Fast_GET_SIZE(keys);
     if (PySequence_Fast_GET_SIZE(values) != envsize) {