--- a/tag.c

+++ b/tag.c

@@ -714,9 +714,12 @@

   frame = id3_tag_findframe(tag, ID3_FRAME_TRACK, 0);

   if (frame) {

-    unsigned int track;

+    id3_ucs4_t const *string;

+    unsigned int track = 0;

-    track = id3_ucs4_getnumber(id3_field_getstrings(&frame->fields[1], 0));

+	string = id3_field_getstrings(&frame->fields[1], 0);

+	if (string)

+    	track = id3_ucs4_getnumber(string);

     if (track > 0 && track <= 0xff) {

       ptr[-2] = 0;

       ptr[-1] = track;