The called constructor method for WP_Widget is deprecated since version 4.3.0

Question

I just updated to WordPress 4.3 and it seems that something is broken.

I get this error that shows up on my page:

Notice: The called construct

Answer 1

I experienced this issue and I found by changing the 'true' statement to 'false' in /wp-includes/functions.php it disabled the errors.

if ( WP_DEBUG && apply_filters( 'deprecated_constructor_trigger_error', true ) ) {