--- a/core/lib/Drupal/Core/Entity/EntityNG.php
+++ b/core/lib/Drupal/Core/Entity/EntityNG.php
@@ -392,18 +392,20 @@ public function getTranslationLanguages($include_default = TRUE) {
     $definitions = $this->getPropertyDefinitions();
     // Build an array with the translation langcodes set as keys. Empty
     // translations should not be included and must be skipped.
-    foreach ($this->getProperties() as $name => $property) {
-      foreach ($this->fields[$name] as $langcode => $field) {
-        if (!$field->isEmpty()) {
-          $translations[$langcode] = TRUE;
+    foreach ($definitions as $name => $definition) {
+      if (isset($this->fields[$name])) {
+        foreach ($this->fields[$name] as $langcode => $field) {
+          if (!$field->isEmpty()) {
+            $translations[$langcode] = TRUE;
+          }
         }
-        if (isset($this->values[$name])) {
-          foreach ($this->values[$name] as $langcode => $values) {
-            // If a value is there but the field object is empty, it has been
-            // unset, so we need to skip the field also.
-            if ($values && !empty($definitions[$name]['translatable']) && !(isset($this->fields[$name][$langcode]) && $this->fields[$name][$langcode]->isEmpty())) {
-              $translations[$langcode] = TRUE;
-            }
+      }
+      if (isset($this->values[$name])) {
+        foreach ($this->values[$name] as $langcode => $values) {
+          // If a value is there but the field object is empty, it has been
+          // unset, so we need to skip the field also.
+          if ($values && !empty($definition['translatable']) && !(isset($this->fields[$name][$langcode]) && $this->fields[$name][$langcode]->isEmpty())) {
+            $translations[$langcode] = TRUE;
           }
         }
       }