From 8383d3bea6ea2e70399abbbadeffeee75edd9d60 Mon Sep 17 00:00:00 2001
From: bl <bletham@gmail.com>
Date: Tue, 4 Jul 2017 00:26:22 -0700
Subject: [PATCH] Check for NULL in ds column

---
 python/fbprophet/forecaster.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/python/fbprophet/forecaster.py b/python/fbprophet/forecaster.py
index c4fa17e..01ae798 100644
--- a/python/fbprophet/forecaster.py
+++ b/python/fbprophet/forecaster.py
@@ -174,6 +174,8 @@ class Prophet(object):
         if 'y' in df:
             df['y'] = pd.to_numeric(df['y'])
         df['ds'] = pd.to_datetime(df['ds'])
+        if df['ds'].isnull().any():
+            raise ValueError('Found NaN in column ds.')
 
         df = df.sort_values('ds')
         df.reset_index(inplace=True, drop=True)