--- a/contrib/python-zstandard/c-ext/decompressionreader.c	Sun Sep 15 00:07:30 2019 -0400
+++ b/contrib/python-zstandard/c-ext/decompressionreader.c	Sun Sep 15 20:04:00 2019 -0700
@@ -653,6 +653,8 @@
 
 		readSize = PyBytes_GET_SIZE(readResult);
 
+		Py_CLEAR(readResult);
+
 		/* Empty read means EOF. */
 		if (!readSize) {
 			break;