From ef7db6a97cdc5d615858f6eaa8d552ea677fe657 Mon Sep 17 00:00:00 2001
From: Pete Harverson <pete@elastic.co>
Date: Tue, 24 Nov 2020 16:56:37 +0000
Subject: [PATCH] [ML] Fix Anomaly Explorer population charts when multiple
 causes in anomaly

---
 x-pack/plugins/ml/public/application/util/chart_utils.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/x-pack/plugins/ml/public/application/util/chart_utils.js b/x-pack/plugins/ml/public/application/util/chart_utils.js
index f2dec5f16df1d..d142d2e246659 100644
--- a/x-pack/plugins/ml/public/application/util/chart_utils.js
+++ b/x-pack/plugins/ml/public/application/util/chart_utils.js
@@ -77,7 +77,10 @@ export function chartExtendedLimits(data = [], functionDescription) {
       metricValue = actualValue;
     }
 
-    if (d.anomalyScore !== undefined) {
+    // Check for both an anomaly and for an actual value as anomalies in detectors with
+    // by and over fields and more than one cause will not have actual / typical values
+    // at the top level of the anomaly record.
+    if (d.anomalyScore !== undefined && actualValue !== undefined) {
       _min = Math.min(_min, metricValue, actualValue, typicalValue);
       _max = Math.max(_max, metricValue, actualValue, typicalValue);
     } else {