diff --git a/src/common/net/Client.cpp b/src/common/net/Client.cpp
index b8de4ffe6..36ddba31b 100644
--- a/src/common/net/Client.cpp
+++ b/src/common/net/Client.cpp
@@ -218,6 +218,10 @@ int64_t Client::submit(const JobResult &result)
     }
 #   endif
 
+    if (m_job.algorithm().variant() == xmrig::VARIANT_WOW && m_job.id() != result.jobId) {
+        return -1;
+    }
+
     using namespace rapidjson;
 
 #   ifdef XMRIG_PROXY_PROJECT
@@ -357,8 +361,8 @@ bool Client::parseJob(const rapidjson::Value &params, int *code)
     if (params.HasMember("height")) {
         const rapidjson::Value &variant = params["height"];
 
-        if (variant.IsInt()) {
-            job.setHeight(variant.GetInt());
+        if (variant.IsUint64()) {
+            job.setHeight(variant.GetUint64());
         }
     }