Minor issues monitored past few months

Hi, i am using your theme and i like it everyday! There only minor issues and I’ll try my best to explain those that i have been monitoring..

Inside single page, we’re missing alt text for thumbnail 150. How can we add it?

<div class="bs-info-author-block py-4 px-3 mb-4 flex-column justify-content-center text-center"> <a class="bs-author-pic mb-3" href="<?php echo esc_url(get_author_posts_url( get_the_author_meta( 'ID' ) ));?>"><?php echo get_avatar( get_the_author_meta( 'ID') , 150); ?></a> <div class="flex-grow-1"> <h2 class="title"><?php esc_html_e('By','blogus'); ?> <a href ="<?php echo esc_url(get_author_posts_url( get_the_author_meta( 'ID' ) ));?>"><?php the_author(); ?></a></h2><p><?php the_author_meta( 'description' ); ?></p> </div></div>

Another one come from JavaScript console

uncaught type error can not set properties of null setting ‘checked’

and uncaught type error can not read properties of null, reading ‘style’ at changethemetoLight