Fixed test break.

docs/guide/configuration.md

@@ -93,15 +93,15 @@ In the above code, four components are configured: `cache`, `user`, `errorHandle
 The configuration array has one special key named `class` that identifies the component's base class. The rest of the keys and values are used
 to configure component properties in the same way as top-level keys are used to configure the application's properties.
 
-Each application has a predefined set of components. To configure one of these, the `class` key can be omitted to use the default Yii class for that component. You can check the `registerCoreComponents()` method of the application you are using
+Each application has a predefined set of components. To configure one of these, the `class` key can be omitted to use the default Yii class for that component. You can check the `coreComponents()` method of the application you are using
 to get a list of component IDs and corresponding classes.
 
 Note that Yii is smart enough to only configure the component when it's actually being used: for example, if you configure the `cache` component in your configuration file but never use the `cache` component in your code, no instance of that component will be created and no time is wasted configuring it.
 
-Setting component defaults classwide
+Setting component defaults class-wide
 ------------------------------------
 
-For each component you can specifiy classwide defaults. For example, if you want to change the class used for all `LinkPager`
+For each component you can specify class-wide defaults. For example, if you want to change the class used for all `LinkPager`
 widgets without specifying the class for every widget usage, you can do the following:
 
 ```php
@@ -115,4 +115,4 @@ widgets without specifying the class for every widget usage, you can do the foll
 ```
 
 The code above should be executed once before `LinkPager` widget is used. It can be done in `index.php`, the application
-configuration file, or anywhere else.
+configuration file, or anywhere else.
\ No newline at end of file

framework/base/Application.php

@@ -211,7 +211,7 @@ abstract class Application extends Module
             foreach ($this->coreComponents() as $id => $component) {
                 if (!isset($config['components'][$id])) {
                     $config['components'][$id] = $component;
-                } elseif (!isset($config['components'][$id]['class'])) {
+                } elseif (is_array($config['components'][$id]) && !isset($config['components'][$id]['class'])) {
                     $config['components'][$id]['class'] = $component['class'];
                 }
             }