From 6fc4f2b249fa3594b7baf6b3dd5846dd06e3078e Mon Sep 17 00:00:00 2001
From: bxdd <bxd98@126.com>
Date: Wed, 27 Jan 2021 07:02:59 +0000
Subject: [PATCH] fix a bug

---
 examples/high_freq/highfreq_handler.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/high_freq/highfreq_handler.py b/examples/high_freq/highfreq_handler.py
index dc69396da..264851031 100644
--- a/examples/high_freq/highfreq_handler.py
+++ b/examples/high_freq/highfreq_handler.py
@@ -195,7 +195,7 @@ class HighFreqBacktestHandler(DataHandler):
         fields = []
         names = []
 
-        template_if = "If(Eq({1}, np.nan), {0}, {1})"
+        template_if = "If(IsNull({1}), {0}, {1})"
         template_paused = "Select(Eq($paused, 0.0), {0})"
         # template_paused="{0}"
         template_fillnan = "FFillNan({0})"