diff --git a/app/dialog/sequence/presetmanager.h b/app/dialog/sequence/presetmanager.h
index 6836e724e..08f88f89f 100644
--- a/app/dialog/sequence/presetmanager.h
+++ b/app/dialog/sequence/presetmanager.h
@@ -41,6 +41,8 @@ class Preset
 public:
   Preset() = default;
 
+  virtual ~Preset(){}
+
   const QString& GetName() const
   {
     return name_;
diff --git a/app/task/render/render.cpp b/app/task/render/render.cpp
index 45bede9e4..abeff4120 100644
--- a/app/task/render/render.cpp
+++ b/app/task/render/render.cpp
@@ -86,7 +86,7 @@ void RenderTask::Render(const TimeRangeList& video_range,
   QVector<rational> times;
   QVector<QByteArray> hashes;
   std::list<HashTimePair> frame_queue;
-  qint64 hash_job_time;
+  qint64 hash_job_time = 0;
 
   if (!video_range.isEmpty()) {
     times = viewer()->video_frame_cache()->GetFrameListFromTimeRange(video_range);