diff --git a/stepmania/src/Notes.cpp b/stepmania/src/Notes.cpp
index 5bdf5c1784..c2c954c1c8 100644
--- a/stepmania/src/Notes.cpp
+++ b/stepmania/src/Notes.cpp
@@ -75,6 +75,7 @@ void Notes::SetNoteData( NoteData* pNewNoteData )
 
 void Notes::GetNoteData( NoteData* pNoteDataOut ) const
 {
+	ASSERT(pNoteDataOut);
 	Decompress();
 	pNoteDataOut->m_iNumTracks = notes->m_iNumTracks;
 	*pNoteDataOut = *notes;