fix error

Author: inhere

src/Application.php

@@ -130,18 +130,17 @@ public function command(string $name, $handler = null, $option = null)
                 return $this;
             }
 
+            // allow define aliases in Command class by Command::aliases()
+            if ($aliases = $handler::aliases()) {
+                $option['aliases'] = isset($option['aliases']) ? \array_merge($option['aliases'], $aliases) : $aliases;
+            }
         } elseif (!\is_object($handler) || !\method_exists($handler, '__invoke')) {
             Helper::throwInvalidArgument(
                 'The console command handler must is an subclass of %s OR a Closure OR a object have method __invoke()',
                 Command::class
             );
         }
 
-        // allow define aliases in Command class by Command::aliases()
-        if ($aliases = $handler::aliases()) {
-            $option['aliases'] = isset($option['aliases']) ? \array_merge($option['aliases'], $aliases) : $aliases;
-        }
-
         // is an class name string
         $this->commands[$name] = $handler;