diff --git a/Python/traceback.c b/Python/traceback.c
--- a/Python/traceback.c
+++ b/Python/traceback.c
@@ -344,7 +344,10 @@
     Py_DECREF(line);
     if (err != 0)
         return err;
-    return _Py_DisplaySourceLine(f, filename, lineno, 4);
+	/* ignore IO errors here, IO may not be ready yet */
+	if ( _Py_DisplaySourceLine(f, filename, lineno, 4) )
+		PyErr_Clear();
+	return err;
 }
 
 static int