diff --git a/Python/traceback.c b/Python/traceback.c
index b928902..c37aab0 100644
--- a/Python/traceback.c
+++ b/Python/traceback.c
@@ -255,6 +255,11 @@
 
     /* use the right encoding to decode the file as unicode */
     fd = PyObject_AsFileDescriptor(binary);
+    if (fd < 0) {
+        Py_DECREF(io);
+        Py_DECREF(binary);
+        return NULL;
+    }
     found_encoding = PyTokenizer_FindEncodingFilename(fd, filename);
     encoding = (found_encoding != NULL) ? found_encoding : "utf-8";
     lseek(fd, 0, 0); /* Reset position */