Index: /trunk/src/VBox/Main/src-client/EbmlWriter.cpp
===================================================================
--- /trunk/src/VBox/Main/src-client/EbmlWriter.cpp	(revision 65331)
+++ /trunk/src/VBox/Main/src-client/EbmlWriter.cpp	(revision 65332)
@@ -760,5 +760,7 @@
         {
             delete itTrack->second;
-            itTrack = m_mapTracks.erase(itTrack);
+            m_mapTracks.erase(itTrack);
+
+            itTrack = m_mapTracks.begin();
         }