From 5477297d105900026a6df1f34df864901cb2cdbc Mon Sep 17 00:00:00 2001
From: "Grot (@grafanabot)" <43478413+grafanabot@users.noreply.github.com>
Date: Sat, 13 May 2023 00:10:31 +0100
Subject: [PATCH] [v9.5.x] Heatmap: Fix log scale editor (#68153)

Heatmap: Fix log scale editor (#68132)

(cherry picked from commit 4ee894b0bea4306bc171a16c0cc5f15fd799b414)

Co-authored-by: Ryan McKinley <ryantxu@gmail.com>
---
 packages/grafana-ui/src/options/builder/axis.tsx | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/packages/grafana-ui/src/options/builder/axis.tsx b/packages/grafana-ui/src/options/builder/axis.tsx
index 6b940e0736c..2a728eff2e7 100644
--- a/packages/grafana-ui/src/options/builder/axis.tsx
+++ b/packages/grafana-ui/src/options/builder/axis.tsx
@@ -150,6 +150,7 @@ const LOG_DISTRIBUTION_OPTIONS: Array<SelectableValue<number>> = [
  */
 export const ScaleDistributionEditor = ({ value, onChange }: StandardEditorProps<ScaleDistributionConfig>) => {
   const type = value?.type ?? ScaleDistribution.Linear;
+  const log = value?.log ?? 2;
   return (
     <>
       <div style={{ marginBottom: 16 }}>
@@ -160,7 +161,7 @@ export const ScaleDistributionEditor = ({ value, onChange }: StandardEditorProps
             onChange({
               ...value,
               type: v!,
-              log: v === ScaleDistribution.Linear ? undefined : value.log ?? 2,
+              log: v === ScaleDistribution.Linear ? undefined : log,
             });
           }}
         />
@@ -169,7 +170,7 @@ export const ScaleDistributionEditor = ({ value, onChange }: StandardEditorProps
         <Field label="Log base">
           <Select
             options={LOG_DISTRIBUTION_OPTIONS}
-            value={value.log ?? 2}
+            value={log}
             onChange={(v) => {
               onChange({
                 ...value,
@@ -183,7 +184,7 @@ export const ScaleDistributionEditor = ({ value, onChange }: StandardEditorProps
         <Field label="Linear threshold">
           <Input
             placeholder="1"
-            value={value.linearThreshold}
+            value={value?.linearThreshold}
             onChange={(v) => {
               onChange({
                 ...value,