From e1b2d61ceba2958aaf91a128f6a9cd5d3a3b41f1 Mon Sep 17 00:00:00 2001
From: Kyle Brandt <kyle@grafana.com>
Date: Tue, 6 Aug 2019 12:28:48 -0400
Subject: [PATCH] backend: null.Float NaN -> null for json marshal (#18284)

---
 pkg/components/null/float.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkg/components/null/float.go b/pkg/components/null/float.go
index 24e7ca4337e..5a5d2af236f 100644
--- a/pkg/components/null/float.go
+++ b/pkg/components/null/float.go
@@ -4,6 +4,7 @@ import (
 	"database/sql"
 	"encoding/json"
 	"fmt"
+	"math"
 	"reflect"
 	"strconv"
 )
@@ -99,7 +100,7 @@ func (f *Float) UnmarshalText(text []byte) error {
 // MarshalJSON implements json.Marshaler.
 // It will encode null if this Float is null.
 func (f Float) MarshalJSON() ([]byte, error) {
-	if !f.Valid {
+	if !f.Valid || math.IsNaN(f.Float64) {
 		return []byte(nullString), nil
 	}
 	return []byte(strconv.FormatFloat(f.Float64, 'f', -1, 64)), nil