diff --git a/libavformat/concatdec.c b/libavformat/concatdec.c
index 78362e2c65..79fb394d45 100644
--- a/libavformat/concatdec.c
+++ b/libavformat/concatdec.c
@@ -216,6 +216,8 @@ static int concat_read_header(AVFormatContext *avf)
     }
     if (ret < 0)
         FAIL(ret);
+    if (!cat->nb_files)
+        FAIL(AVERROR_INVALIDDATA);
 
     for (i = 0; i < cat->nb_files; i++) {
         if (cat->files[i].start_time == AV_NOPTS_VALUE)