website went down after applied some code

I have added some code using this plugin but it causes fatal error, the website went down, so I had to deactivate the plugin through FTP, the error is:
/wp-content/plugins/my-custom-functions/inc/php/functional.php(85) : eval()’d code on line 25

The code was:

function custom_widget_featured_image() {
  global $post;

  echo tribe_event_featured_image( $post->ID, 'thumbnail' );
}
add_action( 'tribe_events_list_widget_before_the_event_title', 'custom_widget_featured_image' )

Now that I want to add a “;” at the final of the code( I think that caused the fatal error) I cannot activate the plugin because is showing the above error:
/wp-content/plugins/my-custom-functions/inc/php/functional.php(85) : eval()’d code on line 25