diff --git a/core/lib/Drupal/Core/Entity/EntityStorageBase.php b/core/lib/Drupal/Core/Entity/EntityStorageBase.php
index 2abbdcd31c..5fc75a613f 100644
--- a/core/lib/Drupal/Core/Entity/EntityStorageBase.php
+++ b/core/lib/Drupal/Core/Entity/EntityStorageBase.php
@@ -270,6 +270,14 @@ public function loadMultiple(array $ids = NULL) {
     $entities = [];
     $preloaded_entities = [];
 
+    // Validate IDs.
+    if ($ids) {
+      if ($invalid_ids = array_filter($ids, function ($id) {
+        return (!is_int($id) && !is_string($id));
+      })) {
+        @trigger_error("Array of IDs passed to loadMultiple() must contain only strings or integers. This will throw an exception in drupal:11.0.0. Invalid IDs were: " . print_r($invalid_ids, TRUE), E_USER_DEPRECATED);
+      }
+    }
     // Create a new variable which is either a prepared version of the $ids
     // array for later comparison with the entity cache, or FALSE if no $ids
     // were passed. The $ids array is reduced as items are loaded from cache,