Uncaught TypeError when modifying Site Logo

Appearance->Customize->Header->Site Identity->Logo->Change Image

But the logo image WAS successfully changed.

PHP Fatal error:  Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, non-static method Sydney_Header::logo() cannot be called statically in /home/flymike/critical_data/http/wordpress.base/wp-includes/customize/class-wp-customize-partial.php:222
Stack trace:
#0 /home/flymike/critical_data/http/wordpress.base/wp-includes/customize/class-wp-customize-selective-refresh.php(372): WP_Customize_Partial->render()
#1 /home/flymike/critical_data/http/wordpress.base/wp-includes/class-wp-hook.php(341): WP_Customize_Selective_Refresh->handle_render_partials_request()
#2 /home/flymike/critical_data/http/wordpress.base/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()
#3 /home/flymike/critical_data/http/wordpress.base/wp-includes/plugin.php(522): WP_Hook->do_action()
#4 /home/flymike/critical_data/http/wordpress.base/wp-includes/template-loader.php(23): do_action()
#5 /home/flymike/critical_data/http/wordpress.base/wp-blog-header.php(19): require_once('...')
#6 /home/flymike/critical_data/http/wordpress.base/index.php(17): require('...')
#7 {main}
  thrown in /home/flymike/critical_data/http/wordpress.base/wp-includes/customize/class-wp-customize-partial.php on line 222

Sydney 2.66, WP 6.9.4