diff --git a/GettextTranslator/Gettext.php b/GettextTranslator/Gettext.php
index 6895ab3..109bb73 100644
--- a/GettextTranslator/Gettext.php
+++ b/GettextTranslator/Gettext.php
@@ -183,7 +183,7 @@ public function translate($message, $form = 1)
 				$this->sessionStorage->newStrings[$this->lang][$message] = empty($message_plural) ? array($message) : array($message, $message_plural);
 			}
 
-			if ($form > 1 && !empty($message_plural)) {
+			if ($form > 1 && !empty($message_plural) && is_string($message_plural)) {
 				$message = $message_plural;
 			}
 		}