diff --git a/libavutil/log.c b/libavutil/log.c
index 5e2b14bbca..fbe9ea0a68 100644
--- a/libavutil/log.c
+++ b/libavutil/log.c
@@ -165,7 +165,8 @@ void av_log(void* avcl, int level, const char *fmt, ...)
 
 void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
 {
-    av_log_callback(avcl, level, fmt, vl);
+    if(av_log_callback)
+        av_log_callback(avcl, level, fmt, vl);
 }
 
 int av_log_get_level(void)