This can happen when av_bsf_free() is called on av_bsf_alloc() failure.

Signed-off-by: James Almer <jamr...@gmail.com>
---
 libavcodec/bsf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/bsf.c b/libavcodec/bsf.c
index 71915dea85..c1653cddb0 100644
--- a/libavcodec/bsf.c
+++ b/libavcodec/bsf.c
@@ -47,7 +47,8 @@ void av_bsf_free(AVBSFContext **pctx)
 
     av_opt_free(ctx);
 
-    av_packet_free(&ctx->internal->buffer_pkt);
+    if (ctx->internal)
+        av_packet_free(&ctx->internal->buffer_pkt);
     av_freep(&ctx->internal);
     av_freep(&ctx->priv_data);
 
-- 
2.22.0

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