diff --git a/pkg/visor/rpc.go b/pkg/visor/rpc.go
index 0a55339645..c2f51362b3 100644
--- a/pkg/visor/rpc.go
+++ b/pkg/visor/rpc.go
@@ -190,7 +190,11 @@ func (r *RPC) StartApp(name *string, _ *struct{}) error {
 
 // StopApp stops App with provided name.
 func (r *RPC) StopApp(name *string, _ *struct{}) error {
-	return r.node.StopApp(*name)
+	err := r.node.StopApp(*name)
+	if err == ErrUnknownApp {
+		err = errors.New("app is either non-existent, or is already stopped")
+	}
+	return err
 }
 
 // SetAutoStartIn is input for SetAutoStart.