diff -r 9e2289c77b04 -r a5698877d14a src/server/util/io.c
--- a/src/server/util/io.c	Thu Sep 08 17:34:16 2022 +0200
+++ b/src/server/util/io.c	Fri Sep 09 20:17:23 2022 +0200
@@ -735,7 +735,7 @@
     va_list arg;
     va_start(arg, format);
     sstr_t buf = ucx_vasprintf(ucx_default_allocator(), format, arg);
-    ssize_t r = net_write(fd, buf.ptr, buf.length);
+    ssize_t r = buf.length > 0 ? net_write(fd, buf.ptr, buf.length) : 0;
     free(buf.ptr);
     va_end(arg);
     if(r < 0) {