:: commit 56c24ca1f8f25e648d42154369b6962600f76465

diff --git a/src/main.c b/src/main.c
index cd438a4..bffd798 100644
--- a/src/main.c
+++ b/src/main.c
@@ -76,6 +76,8 @@ static void help() {
 }
 
 static void xwrite(const void * data, size_t size, size_t len, FILE * des) {
+    if (len == 0 || size == 0)
+        return;
     if (fwrite(data, size, len, des) != len) {
         fprintf(stderr, "Write error: %s\n", strerror(errno));
         exit(1);