diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 597e7a71d0bfab54969af415d6b5986a78a25220..a3c51e0b49edffe12bda6c5a035438a632338464 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -28,7 +28,7 @@
 
 #define LIBAVFILTER_VERSION_MAJOR  1
 #define LIBAVFILTER_VERSION_MINOR 73
-#define LIBAVFILTER_VERSION_MICRO  0
+#define LIBAVFILTER_VERSION_MICRO  1
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \
diff --git a/libavfilter/avfiltergraph.c b/libavfilter/avfiltergraph.c
index cad601be1ef49f98379d7e54197e49f0033b5ab1..a62fe2f79dec54472d457f78b392a78fa2e09f7d 100644
--- a/libavfilter/avfiltergraph.c
+++ b/libavfilter/avfiltergraph.c
@@ -34,6 +34,8 @@ AVFilterGraph *avfilter_graph_alloc(void)
 
 void avfilter_graph_free(AVFilterGraph *graph)
 {
+    if (!graph)
+        return;
     for (; graph->filter_count > 0; graph->filter_count --)
         avfilter_free(graph->filters[graph->filter_count - 1]);
     av_freep(&graph->scale_sws_opts);
diff --git a/libavfilter/avfiltergraph.h b/libavfilter/avfiltergraph.h
index 74d7a128129a84dbb20ee841877934524ad9a32c..1b0d242dc59a0e4a27d37416e6959dbe8f90ced8 100644
--- a/libavfilter/avfiltergraph.h
+++ b/libavfilter/avfiltergraph.h
@@ -79,7 +79,7 @@ int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
 int avfilter_graph_config(AVFilterGraph *graphctx, AVClass *log_ctx);
 
 /**
- * Free a graph and destroy its links.
+ * Free a graph and destroy its links, graph may be NULL.
  */
 void avfilter_graph_free(AVFilterGraph *graph);