diff --git a/Objects/namespaceobject.c b/Objects/namespaceobject.c
index 5b7547103a2b3fc..c450a51bbc3b99e 100644
--- a/Objects/namespaceobject.c
+++ b/Objects/namespaceobject.c
@@ -141,6 +141,11 @@ namespace_repr(PyObject *ns)
             goto error;
     }
 
+    /* Check if loop ended because of exception in PyIter_Next */
+    if (PyErr_Occurred()) {
+        goto error;
+    }
+
     separator = PyUnicode_FromString(", ");
     if (separator == NULL)
         goto error;