Either a blank website page or a fatal error as shown in the example below:
Call to undefined method WP_Error::get_items()
Call to undefined method wpdb::preapare()
The only cause for this fatal error is that requested method does not exist in the calling object. Typically this error occurs when initiated variable contains unexpected object value and developer did not take this case in consideration. In rare cases, the name of the method can be misspelled or simply does exist in the depending object.
In order to fix this fatal error, you should have good knowledge in PHP to debug the source code.
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The example below shows how to fix “call to undefined method” fatal error. This solution ensures that your website get executed even when a called method does not exist anymore in the website’s codebase.
@@ -11,9 +11,9 @@
- if ($page->is_shop()) :
+ if ( method_exists($page, 'is_shop') && $page->is_shop())) :