diff --git a/deps/ox/src/ox/oc/write.hpp b/deps/ox/src/ox/oc/write.hpp
index 1073238b..79713591 100644
--- a/deps/ox/src/ox/oc/write.hpp
+++ b/deps/ox/src/ox/oc/write.hpp
@@ -89,7 +89,7 @@ class OrganicClawWriter {
 
 template<typename T>
 Error OrganicClawWriter::field(const char *key, T *val, std::size_t len) noexcept {
-	if (targetValid()) {
+	if (targetValid() && len) {
 		OrganicClawWriter w((Json::Value(Json::arrayValue)));
 		for (std::size_t i = 0; i < len; ++i) {
 			oxReturnError(w.field("", &val[i]));