diff --git a/.travis.yml b/.travis.yml
index 1420f4b..65d7f59 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,12 +1,12 @@
 language: php
 
 php:
-  - 5.4
-  - 5.5
   - 5.6
   - 7.0
   - 7.1
   - 7.2
+  - 7.3
+  - 7.4
 
 sudo: false
 dist: trusty
diff --git a/Model/QuizExport.php b/Model/QuizExport.php
index ebe9568..cca33b3 100644
--- a/Model/QuizExport.php
+++ b/Model/QuizExport.php
@@ -73,7 +73,11 @@ public function getExportData($quizKey) {
 		$Plugin = ClassRegistry::init('PluginManager.Plugin');
 		$composer = $Plugin->getComposer('netcommons/quizzes');
 		// 最初のデータは小テストプラグインのバージョン
-		$zipData['version'] = $composer['version'];
+		if (isset($composer['version'])) {
+			$zipData['version'] = $composer['version'];
+		} else {
+			$zipData['version'] = null;
+		}
 
 		// 言語数分
 		$Language = ClassRegistry::init('M17n.Language');