1 files changed, 1 insertions, 1 deletions
diff --git a/convert.c b/convert.c
index 814e814438..02d5f1e23c 100644
--- a/convert.c
+++ b/convert.c
@@ -395,7 +395,7 @@ static int apply_filter(const char *path, const char *src, size_t len, int fd,
 	struct async async;
 	struct filter_params params;
 
-	if (!cmd)
+	if (!cmd || !*cmd)
 		return 0;
 
 	if (!dst)