diff --git a/src/Plugin/monitoring/SensorPlugin/ContentEntityAggregatorSensorPlugin.php b/src/Plugin/monitoring/SensorPlugin/ContentEntityAggregatorSensorPlugin.php
index 5594e85..3ff4ccd 100644
--- a/src/Plugin/monitoring/SensorPlugin/ContentEntityAggregatorSensorPlugin.php
+++ b/src/Plugin/monitoring/SensorPlugin/ContentEntityAggregatorSensorPlugin.php
@@ -344,7 +344,7 @@ class ContentEntityAggregatorSensorPlugin extends DatabaseAggregatorSensorPlugin
     );
 
     // Fill the sensors table with form elements for each sensor.
-    $conditions = array_values($this->sensorConfig->getSetting('conditions'));
+    $conditions = array_values($this->sensorConfig->getSetting('conditions', []));
     if (empty($conditions)) {
       $conditions = [];
     }