Above, you mentioned that the error is caused in line 105 due to the following code:

$output .= ‘”>tree_type ) . ‘”>’ . apply_filters( ‘list_product_cats’, $cat->name, $cat ) . ‘‘;

The corresponding function within WooCommerce can be found on https://github.com/woocommerce/woothemes_site/blob/efdee42c700e7716cd325fcdf047648bc7821dc9/wp-content/plugins/woocommerce/includes/walkers/class-product-cat-list-walker.php#L55-L83 and does not contain that line of code.

Could you create a screenshot of this problem, so that we can see exactly what you are seeing?

But thanks for your help.