From 586b89f7767a937133fc71ea945de97edcea23fc Mon Sep 17 00:00:00 2001
From: Leon Sorokin <leeoniya@gmail.com>
Date: Thu, 10 Feb 2022 11:49:30 -0600
Subject: [PATCH] Thresholds: fix crash when trying to render zero-height base
 thresholds (#45256)

---
 .../grafana-ui/src/components/uPlot/config/gradientFills.ts   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/grafana-ui/src/components/uPlot/config/gradientFills.ts b/packages/grafana-ui/src/components/uPlot/config/gradientFills.ts
index c3daf47fb0a..f1443c6d587 100644
--- a/packages/grafana-ui/src/components/uPlot/config/gradientFills.ts
+++ b/packages/grafana-ui/src/components/uPlot/config/gradientFills.ts
@@ -134,6 +134,10 @@ export function scaleGradient(u: uPlot, scaleKey: string, scaleStops: ScaleValue
 
   let range = minStopPos - maxStopPos;
 
+  if (range === 0) {
+    return scaleStops[maxStopIdx!][1];
+  }
+
   let x0, y0, x1, y1;
 
   if (u.scales.x!.ori === ScaleOrientation.Horizontal) {