diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9ea6ecc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+composer.phar
+.idea/
+vendor/
+
+
diff --git a/src/Model/Message/AppMessage.php b/src/Model/Message/AppMessage.php
index 055e8ab..b227499 100644
--- a/src/Model/Message/AppMessage.php
+++ b/src/Model/Message/AppMessage.php
@@ -167,7 +167,7 @@ public function jsonSerialize()
         if ($this->traceId != null) $data["trace_id"] = $this->traceId;
         if ($this->appId != null) $data["app_id"] = $this->appId;
         if ($this->header != null) $data["header"] = $this->header;
-        if ($this->userUniqueId != null) $data["user_unique_id"] = $this->userUniqueId;
+        if ($this->userUniqueId !== null) $data["user_unique_id"] = $this->userUniqueId;
         if ($this->eventV3 != null) $data["event_v3"] = $this->eventV3;
         return $data;
     }
diff --git a/test/HttpTester.php b/test/HttpTester.php
index 0605e9c..3633e47 100644
--- a/test/HttpTester.php
+++ b/test/HttpTester.php
@@ -47,6 +47,11 @@
 $header->setUserUniqueId("test-uuid2");
 $header->setClientIp("49.7.44.244");
 $header->setOs("android");
+$header->setDeviceId(7786627007290925058);
+
+$rc->sendUserDefineEvent($header, "", 10000000, null, "php_event_with_anonymous",
+    ["php_name" => "php", "php_version" => "5.6", "float_param" => floatval(5), "session_id" => "1234567890"]);
+
 
 $rc->sendUserDefineEvent($header, "test-uuid2", 10000000, null, "php_event_with_items",
     ["php_name" => "php", "php_version" => "5.6", "float_param" => floatval(5), "session_id" => "1234567890"], $items);
@@ -71,3 +76,5 @@
     [["php_name" => "php", "php_version" => "5.6"]], [
         [["item_name" => "book", "item_id" => "0001"], ["item_name" => "book", "item_id" => "0002"]]
     ]);
+
+sleep(10);