diff --git a/BallCamera.go b/BallCamera.go
index f8dd5c7..4effbbb 100644
--- a/BallCamera.go
+++ b/BallCamera.go
@@ -423,7 +423,6 @@ func verify(data []byte) (byte, error) {
 	for i := 1; i < 6; i++ {
 		sum += int(data[i])
 	}
-
 	// 取模并转换为16进制
 	checksum := sum % 0x100
 	return byte(checksum), nil
diff --git a/Nvr.go b/Nvr.go
index a8771be..ddd6fee 100644
--- a/Nvr.go
+++ b/Nvr.go
@@ -167,6 +167,9 @@ func (this *Nvr) Logout() error {
 }
 
 func (this *Nvr) Status() bool {
+	if this == nil {
+		return false
+	}
 	return Core.NET_DVR_RemoteControl(this.userId)
 }