[wp-trac] [WordPress Trac] #21515: No custom header support in theme == Fatal error: Call to a member function process_default_headers() on a non-object

[WordPress Trac]

#21515: No custom header support in theme == Fatal error: Call to a member function
process_default_headers() on a non-object
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 Reporter:  c3mdigital        |       Owner:  ryan
     Type:  defect (bug)      |      Status:  closed
 Priority:  normal            |   Milestone:  3.4.2
Component:  Customize         |     Version:
 Severity:  normal            |  Resolution:  fixed
 Keywords:  has-patch commit  |     Focuses:
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Comment (by vizvizka):

 Replying to [comment:8 bloomhejm]:
 > WordPress. The error message you provided indicates that there is an
 issue with the WP_Customize_Header_Image_Control class and its
 process_default_headers() method being called on a non-object. This error
 typically occurs when you attempt to use the Customizer with a theme that
 doesn't support custom headers.
 > Here's a possible solution to handle this error by checking whether the
 WP_Customize_Header_Image_Control object exists before calling its
 methods:
 >
 >
 > {{{#!php
 > <?php
 > if ( class_exists( 'WP_Customize_Header_Image_Control' ) ) {
 >     $custom_image_header = new WP_Customize_Header_Image_Control(
 $wp_customize );
 >     if ( is_object( $custom_image_header ) ) {
 >         // Process custom header controls here
 >     }
 > }
 > }}}
 >
 > This code snippet checks if the WP_Customize_Header_Image_Control class
 exists, and if it does, it attempts to create an instance of it. Then, it
 checks if the instance is a valid object before proceeding to process
 custom header controls.


 In addition to resolving the WP_Customize_Header_Image_Control error, are
 there any best practices for handling similar issues where functions or
 methods may be called on non-existent objects or classes in WordPress? How
 can we proactively prevent such errors from occurring in custom theme or
 plugin development?

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Ticket URL: <https://core.trac.wordpress.org/ticket/21515#comment:9>
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