diff --git a/trunk/ConsoleDataMigration/ConsoleRestore/NtpClient.cpp b/trunk/ConsoleDataMigration/ConsoleRestore/NtpClient.cpp
index 53fca15..86db382 100644
--- a/trunk/ConsoleDataMigration/ConsoleRestore/NtpClient.cpp
+++ b/trunk/ConsoleDataMigration/ConsoleRestore/NtpClient.cpp
@@ -342,7 +342,8 @@ void NtpThreadFunc()
 
 bool IsTimeAdjustFinished()
 {
-    return !s_NtpThread.IsAlive();
+    // Initialize済みかつ終了
+    return s_NtpThread.IsValid() && !s_NtpThread.IsAlive();
 }
 
 bool IsTimeAdjustSuccessed()