diff --git a/classes/Language.php b/classes/Language.php
index 92442471e07e0..d64c40afef723 100644
--- a/classes/Language.php
+++ b/classes/Language.php
@@ -944,7 +944,8 @@ public static function updateModulesTranslations(Array $modules_list)
 					if (isset($file['filename']) && is_string($file['filename']))
 						$files_listing[] = $file['filename'];
 			}
-			$gz->extractList($files_listing, _PS_TRANSLATIONS_DIR_.'../', '');
+			if ($gz) // $gz is initialized inside th eforeach... it may not be initialized if no loop is done (case of not conencted to the internet)
+				$gz->extractList($files_listing, _PS_TRANSLATIONS_DIR_.'../', '');
 		}
 	}
-}
\ No newline at end of file
+}