diff --git a/internal/ga/client_test.go b/internal/ga/client_test.go
index a1e1cae4..d1c29a72 100644
--- a/internal/ga/client_test.go
+++ b/internal/ga/client_test.go
@@ -8,7 +8,7 @@ func TestSendEvents(t *testing.T) {
 	event := EventTracking{
 		Category: "unittest",
 		Action:   "SendEvents",
-		Value:    "123",
+		Value:    123,
 	}
 	err := gaClient.SendEvent(event)
 	if err != nil {
@@ -21,7 +21,7 @@ func TestStructToUrlValues(t *testing.T) {
 		Category: "unittest",
 		Action:   "convert",
 		Label:    "v0.3.0",
-		Value:    "123",
+		Value:    123,
 	}
 	val := structToUrlValues(event)
 	if val.Encode() != "ea=convert&ec=unittest&el=v0.3.0&ev=123" {
diff --git a/internal/ga/events.go b/internal/ga/events.go
index 2044d196..99e91179 100644
--- a/internal/ga/events.go
+++ b/internal/ga/events.go
@@ -17,7 +17,7 @@ type EventTracking struct {
 	Category string `form:"ec"` // Required. Event Category.
 	Action   string `form:"ea"` // Required. Event Action.
 	Label    string `form:"el"` // Optional. Event label, used as version.
-	Value    string `form:"ev"` // Optional. Event value, must be digits, "123"
+	Value    int    `form:"ev"` // Optional. Event value, must be non-negative integer
 }
 
 func (e EventTracking) StartTiming(variable string) UserTimingTracking {
diff --git a/plugin.go b/plugin.go
index 6a5cf1f7..7748e207 100644
--- a/plugin.go
+++ b/plugin.go
@@ -35,10 +35,16 @@ func (p *parser) loadPlugin(path string) error {
 	}
 
 	// report event for loading go plugin
-	go ga.SendEvent(ga.EventTracking{
-		Category: "LoadGoPlugin",
-		Action:   "plugin.Open",
-	})
+	defer func() {
+		event := ga.EventTracking{
+			Category: "LoadGoPlugin",
+			Action:   "plugin.Open",
+		}
+		if err != nil {
+			event.Value = 1 // failed
+		}
+		go ga.SendEvent(event)
+	}()
 
 	// load plugin
 	plugins, err := plugin.Open(pluginPath)