diff --git a/src/Plugin/monitoring/SensorPlugin/ContentEntityAggregatorSensorPlugin.php b/src/Plugin/monitoring/SensorPlugin/ContentEntityAggregatorSensorPlugin.php
index 6bae2ca..0228c25 100644
--- a/src/Plugin/monitoring/SensorPlugin/ContentEntityAggregatorSensorPlugin.php
+++ b/src/Plugin/monitoring/SensorPlugin/ContentEntityAggregatorSensorPlugin.php
@@ -244,10 +244,20 @@ class ContentEntityAggregatorSensorPlugin extends DatabaseAggregatorSensorPlugin
             break;
 
           default:
-            if (is_subclass_of($entity, '\Drupal\Core\Entity\FieldableEntityInterface', TRUE) && $entity->hasField($field)) {
-              $property = $entity->getFieldDefinition($field)->getFieldStorageDefinition()->getMainPropertyName();
-              $value = $entity->$field->view(['label' => 'hidden']);
-              $row[] = $value ? \Drupal::service('renderer')->renderPlain($value) : $entity->$field->$property;
+            // Make sure the field exists on this entity.
+            if ($entity instanceof FieldableEntityInterface && $entity->hasField($field)) {
+              try {
+                // Get the main property as a fallback if the field can not be
+                // viewed.
+                $property = $entity->getFieldDefinition($field)->getFieldStorageDefinition()->getMainPropertyName();
+                $value = $entity->$field->view(['label' => 'hidden']);
+                // Try to render the field, fall back the main property.
+                $row[] = $value ? \Drupal::service('renderer')->renderPlain($value) : $entity->$field->$property;
+              } catch (\Exception $e) {
+                // Catch any exception and display as an error.
+                drupal_set_message(t('Error while trying to display %field: @error', ['%field' => $field, '@error' => $e->getMessage()]), 'error');
+                $row[] = '';
+              }
             }
             else {
               $row[] = '';
@@ -302,7 +312,7 @@ class ContentEntityAggregatorSensorPlugin extends DatabaseAggregatorSensorPlugin
     $options = [];
     foreach ($entity_types as $id => $label) {
       $class = $this->entityManager->getDefinition($id)->getClass();
-      if (is_subclass_of($class, '\Drupal\Core\Entity\ContentEntityInterface', TRUE)) {
+      if (is_subclass_of($class, '\Drupal\Core\Entity\FieldableEntityInterface')) {
         $options[$id] = $label;
       };
     }