From e012301c8596118578c4abef178955888d02b435 Mon Sep 17 00:00:00 2001
From: Oliver Vogel <oliver@olivervogel.net>
Date: Fri, 12 Dec 2014 16:45:28 +0100
Subject: [PATCH] bugfix

---
 src/Intervention/Image/Commands/Argument.php |  4 +++-
 tests/ArgumentTest.php                       | 11 +++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/Intervention/Image/Commands/Argument.php b/src/Intervention/Image/Commands/Argument.php
index 1ee0c962..ee33dcef 100644
--- a/src/Intervention/Image/Commands/Argument.php
+++ b/src/Intervention/Image/Commands/Argument.php
@@ -52,8 +52,10 @@ class Argument
         $arguments = $this->command->arguments;
 
         if (is_array($arguments)) {
-            return array_key_exists($this->key, $arguments) ? $arguments[$this->key] : $default;
+            return isset($arguments[$this->key]) ? $arguments[$this->key] : $default;
         }
+
+        return $default;
     }
 
     /**
diff --git a/tests/ArgumentTest.php b/tests/ArgumentTest.php
index 1a187c4e..54e4d5d8 100644
--- a/tests/ArgumentTest.php
+++ b/tests/ArgumentTest.php
@@ -397,6 +397,17 @@ class ArgumentTest extends PHPUnit_Framework_TestCase
         $arg->max(10);
     }
 
+    public function testValueDefault()
+    {
+        $arg = new Argument($this->getMockedCommand());
+        $value = $arg->value('foo');
+        $this->assertEquals('foo', $value);
+
+        $arg = new Argument($this->getMockedCommand(array(null)));
+        $value = $arg->value('foo');
+        $this->assertEquals('foo', $value);
+    }
+
     private function validateArgument($argument, $value)
     {
         $this->assertInstanceOf('\Intervention\Image\Commands\Argument', $argument);