diff --git a/Changelog.md b/Changelog.md
index 1919b98..c55943d 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -4,6 +4,7 @@
 - added new setting to start with maximized window
 - long file names work now even if not enabled by the OS
 - fixed history being written even when history file wasn't created prior
+- libmpv updated to shinchiro 2019-08-31
 
 ### 5.3
 
diff --git a/mpv.net/WinForms/MainForm.cs b/mpv.net/WinForms/MainForm.cs
index 049bd9b..b4ecc39 100644
--- a/mpv.net/WinForms/MainForm.cs
+++ b/mpv.net/WinForms/MainForm.cs
@@ -387,10 +387,10 @@ namespace mpvnet
                 else
                     Text = "mpv.net " + Application.ProductVersion;
 
-                double duration = mp.get_property_number("duration");
                 ProgressTimer.Interval = (int)(mp.Duration.TotalMilliseconds / 99);
                 if (ProgressTimer.Interval < 100) ProgressTimer.Interval = 100;
                 if (ProgressTimer.Interval > 999) ProgressTimer.Interval = 999;
+                UpdateProgressBar();
             }));
 
             if (RecentFiles.Contains(path)) RecentFiles.Remove(path);
@@ -513,7 +513,7 @@ namespace mpvnet
 
         void UpdateProgressBar()
         {
-            if (mp.TaskbarProgress)
+            if (mp.TaskbarProgress && Taskbar != null)
                 Taskbar.SetValue(mp.get_property_number("time-pos"), mp.Duration.TotalSeconds);
         }