diff --git a/entitycache.module b/entitycache.module
index dce177f..924656d 100644
--- a/entitycache.module
+++ b/entitycache.module
@@ -90,6 +90,15 @@ class EntityCacheControllerHelper extends DrupalDefaultEntityController {
       }
     }
 
+    // Ensure integer entity IDs are valid.
+    if (!empty($ids)) {
+      $ids = $this->cleanIds($ids);
+      // If all passed IDs have been filtered out, do not return any entities.
+      if (empty($ids)) {
+        return $entities;
+      }
+    }
+
     // Load any remaining entities from the database. This is the case if $ids
     // is set to FALSE (so we load all entities), if there are any ids left to
     // load, if loading a revision, or if $conditions was passed without $ids.
@@ -145,6 +154,34 @@ class EntityCacheControllerHelper extends DrupalDefaultEntityController {
     return $entities;
   }
 
+
+  /**
+   * Ensures integer entity IDs are valid.
+   *
+   * The identifier sanitization provided by this method has been introduced
+   * as Drupal used to rely on the database to facilitate this, which worked
+   * correctly with MySQL but led to errors with other DBMS such as PostgreSQL.
+   *
+   * @param array $ids
+   * The entity IDs to verify.
+   * @return array
+   * The sanitized list of entity IDs.
+   */
+  protected function cleanIds($ids) {
+    $base_table_schema = drupal_get_schema($this->entityInfo['base table']);
+    if (isset($base_table_schema['fields'][$this->idKey]['type'])) {
+      $id_type = $base_table_schema['fields'][$this->idKey]['type'];
+      if ($id_type == 'serial' || $id_type == 'int') {
+        $ids = array_filter($ids, function ($id) {
+          return is_numeric($id) && $id == (int) $id;
+        });
+        $ids = array_map('intval', $ids);
+      }
+    }
+    return $ids;
+  }
+
+
   public static function entityCacheGet($controller, $ids, $conditions = array()) {
     $cached_entities = array();
     if ($ids && !$conditions) {