This would happen at least when lavr is used as a fifo with no
conversion.
---
 libavresample/utils.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavresample/utils.c b/libavresample/utils.c
index e533760..6d4509d 100644
--- a/libavresample/utils.c
+++ b/libavresample/utils.c
@@ -375,7 +375,8 @@ int avresample_convert(AVAudioResampleContext *avr, void 
**output,
         }
     }
 
-    return handle_buffered_output(avr, &output_buffer, current_buffer);
+    return handle_buffered_output(avr, output ? &output_buffer : NULL,
+                                  current_buffer);
 }
 
 int avresample_available(AVAudioResampleContext *avr)
-- 
1.7.9.5

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