diff --git a/libavformat/mov.c b/libavformat/mov.c
index 0f4a5cd9a3..bd6b23466b 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -10341,7 +10341,7 @@ static int mov_parse_heif_items(AVFormatContext *s)
         st->codecpar->height = item->height;
 
         err = sanity_checks(s, sc, item->item_id);
-        if (err)
+        if (err || !sc->sample_count)
             return AVERROR_INVALIDDATA;
 
         sc->sample_sizes[0]  = item->extent_length;