From c063c748e1e1d94c06816364904647300b733c56 Mon Sep 17 00:00:00 2001
From: Minchul Lee <bab2min@gmail.com>
Date: Sat, 6 Jun 2020 16:23:06 +0900
Subject: [PATCH] fixed for GDMR without metadata_range

---
 src/python/py_GDMR.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/python/py_GDMR.cpp b/src/python/py_GDMR.cpp
index 43369b0..068fba5 100644
--- a/src/python/py_GDMR.cpp
+++ b/src/python/py_GDMR.cpp
@@ -47,10 +47,11 @@ static int GDMR_init(TopicModelObject *self, PyObject *args, PyObject *kwargs)
 		self->minWordDf = minDf;
 		self->removeTopWord = rmTop;
 
-		if (objRange)
+		if (objRange && objRange != Py_None)
 		{
 			vector<float> vMin, vMax;
 			py::UniqueObj rangeIter = PyObject_GetIter(objRange), item;
+			if(!rangeIter) throw runtime_error{ "`metadata_range` must be a list of pairs." };
 			while (item = PyIter_Next(rangeIter))
 			{
 				item = PyObject_GetIter(item);