Can't use function return value in write context

I got this error:
PHP Fatal error: Can’t use function return value in write context in wp-content/themes/fundingpress/funding/tpl/f-fund-project.php on line 122

which refers to this line:

?php if(of_get_option(‘po_gateways’) == ‘1’ && !empty(get_user_meta(get_the_author_meta( ‘ID’ ), ‘paypal_email’, true))){ ?>

I am not an expert in php, but guys out there solve this by changing this line to:

?php if(of_get_option(‘po_gateways’) == ‘1’ && !get_user_meta(get_the_author_meta( ‘ID’ ), ‘paypal_email’, true)){ ?>

Is this fine for you? Are you gonna update it?

Best,

Tino