From b0f8e803a1661cdee902ae238bc748ec347e864e Mon Sep 17 00:00:00 2001
From: Galen Kistler <109082771+gtk-grafana@users.noreply.github.com>
Date: Mon, 12 Dec 2022 07:44:15 -0600
Subject: [PATCH] Prometheus: Fix exception being thrown when toggling
 visibility in explore (#60159)

fix error being thrown when frameIndex is out of bounds of dataframe
---
 .../app/plugins/panel/timeseries/plugins/ExemplarsPlugin.tsx  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/public/app/plugins/panel/timeseries/plugins/ExemplarsPlugin.tsx b/public/app/plugins/panel/timeseries/plugins/ExemplarsPlugin.tsx
index 8f15fae1e88..7539afc8671 100644
--- a/public/app/plugins/panel/timeseries/plugins/ExemplarsPlugin.tsx
+++ b/public/app/plugins/panel/timeseries/plugins/ExemplarsPlugin.tsx
@@ -119,8 +119,8 @@ export const getVisibleLabels = (config: UPlotConfigBuilder, frames: DataFrame[]
       const fieldIndex = plotInstance.props?.dataFrameFieldIndex?.fieldIndex;
 
       if (frameIndex !== undefined && fieldIndex !== undefined) {
-        const field = frames[frameIndex].fields[fieldIndex];
-        if (field.labels) {
+        const field = frames[frameIndex]?.fields[fieldIndex];
+        if (field?.labels) {
           // Note that this may be an empty object in the case of a metric being rendered with no labels
           visibleLabels.push({
             labels: field.labels,