diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index ef26b05b3b..f27b70c0c6 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -211,7 +211,7 @@ static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vst
         case AMF_DATA_TYPE_OBJECT: {
             unsigned int keylen;
 
-            if (!strcmp(KEYFRAMES_TAG, key) && depth == 1)
+            if (key && !strcmp(KEYFRAMES_TAG, key) && depth == 1)
                 if (parse_keyframes_index(s, ioc, vstream, max_pos) < 0)
                     return -1;