diff --git a/bot/Bot.php b/bot/Bot.php
index ae0da97..cdfa45f 100644
--- a/bot/Bot.php
+++ b/bot/Bot.php
@@ -51,9 +51,9 @@ class Bot
             $preg_pattern = sprintf('#%s#i', $pattern);
             if (preg_match($preg_pattern, $sentence, $matches)) {
                 if (is_callable($command)) {
-                    $command($this);
+                    call_user_func($command, $this);
                 } else {
-                    $command->getMessage($this, $matches);
+                    call_user_func([$command, 'getMessage'], $this, $matches);
                 }
                 return;
             }