get_term_link() Throwing Error

I am using the following code to get the ID number of a term:

<?php
	$terms = get_the_terms( $post->ID, 'parent-company' );
	if ( $terms && ! is_wp_error( $terms ) ) :
		$parentCompany = array();
		foreach ( $terms as $term ) {
			$termId[] = $term->term_id;
		}
		$termId = join( ", ", $termId );
?>

The value of $termId in this case is just ’70’. And I’m trying to use it like so:

<li><a href="<?php echo get_term_link($termId, 'parent-company'); ?>">View Franchisees:</a></li>

However it gives the following error:
Catchable fatal error: Object of class WP_Error could not be converted to string in...

Whereas if I try :
<li><a href="<?php echo get_term_link(70, 'parent-company'); ?>">View Franchisees:</a></li>

Then it works fine! Does anyone know what I might be doing wrong?