diff --git a/libavformat/mp3dec.c b/libavformat/mp3dec.c
index 44de9b57e7e9f9bce1a43bd1793deeec141c7189..4b919b0880b8a675097b9320fc57a850d832a38c 100644
--- a/libavformat/mp3dec.c
+++ b/libavformat/mp3dec.c
@@ -63,6 +63,9 @@ static int mp3_read_probe(AVProbeData *p)
     const uint8_t *buf, *buf0, *buf2, *end;
     AVCodecContext *avctx = avcodec_alloc_context3(NULL);
 
+    if (!avctx)
+        return 0;
+
     buf0 = p->buf;
     end = p->buf + p->buf_size - sizeof(uint32_t);
     while(buf0 < end && !*buf0)