From 6f990c5976549c9abd76a240cd3730125efca724 Mon Sep 17 00:00:00 2001
From: Priveyes <3041616+Pascal66@users.noreply.github.com>
Date: Sun, 23 May 2021 18:49:07 +0200
Subject: [PATCH] Fix a rare error in save_result : ValueError: Out of range
 float values are not JSON compliant

freqtrade/freqtrade/optimize/hyperopt.py", line 166, in _save_result
    rapidjson.dump(epoch, f, default=str, number_mode=rapidjson.NM_NATIVE)
ValueError: Out of range float values are not JSON compliant
---
 freqtrade/optimize/hyperopt.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/freqtrade/optimize/hyperopt.py b/freqtrade/optimize/hyperopt.py
index cf5559a24..cba82cee6 100644
--- a/freqtrade/optimize/hyperopt.py
+++ b/freqtrade/optimize/hyperopt.py
@@ -163,7 +163,7 @@ class Hyperopt:
         :param epoch: result dictionary for this epoch.
         """
         with self.results_file.open('a') as f:
-            rapidjson.dump(epoch, f, default=str, number_mode=rapidjson.NM_NATIVE)
+            rapidjson.dump(epoch, f, default=str, number_mode=rapidjson.NM_NATIVE | rapidjson.NM_NAN)
             f.write("\n")
 
         self.num_epochs_saved += 1