almost-spring header.php modification

I am using almost-spring theme. I want to see my category name instead of my blog name when clicked on categories. So I changed the header.php in almost spring theme as below:

original:

PHP Code:
‘ <div id=”header”>
<h1>“><?php bloginfo(‘name’); ?></h1>
</div> ‘

modified:

PHP Code:
‘ <div id=”header”>
<h1>“>
<?php
if (single_cat_title() != “”) {
echo single_cat_title();
}
else{
echo “My Blog Name”;
}
?></h1>
</div> ‘

The Result is below when I clicked the category name:

My Category NameMy Blog Name

I only want the category name, is there something wrong with the PHP code?

Thank you,