diff --git a/src/NoteData.cpp b/src/NoteData.cpp
index bd8de09ef2..ece1d84872 100644
--- a/src/NoteData.cpp
+++ b/src/NoteData.cpp
@@ -1178,12 +1178,19 @@ void NoteData::LoadFromNode( const XNode* pNode )
 
 void NoteData::AddATIToList(all_tracks_iterator* iter) const
 {
+	// mapconv crashes on windows an apparently this function is the cause.
+	// So windows will still crash on courses that use transform mods until
+	// mapconv can be fixed. -Kyz
+#ifndef WIN32
 	m_atis.insert(iter);
+#endif
 }
 
 void NoteData::AddATIToList(all_tracks_const_iterator* iter) const
 {
+#ifndef WIN32
 	m_const_atis.insert(iter);
+#endif
 }
 
 void NoteData::RemoveATIFromList(all_tracks_iterator* iter) const