if term exists problem with wp_insert_term

Hi I hope somebody will be able to help me, I am building a site which allows users to add products from the front end to a woocommerce its all working well except I am not able to check whether a product category exists and if it does link the product to it or if doesn’t create the term/ product category and link it to it (allowing for multiple categories below is the code which I have

foreach ($mycategories as $mycat){
	$myterm = term_exists($mycat->Name, 'product_cat');
if ($myterm !== 0 && $myterm !== null) {
 	$cat_ID_array = 	get_term_by( 'name', $cat->Name, 'product_cat');
$cat_ID = $cat_ID_array->term_id;
} else {
 $cat_name = $cat->Name;
   $catid = wp_insert_term($cat_name, 'product_cat');
<em>$cat_ID = $catid['term_id'];</em>

}
	 echo '<input type="checkbox" name="prod_category[]" checked value="'.$cat_ID.'" ><label>'.$cat->Name.'</label>';
	}
foreach ($subcategories as $subcat){
	$subterm = term_exists($subcat->Name, 'product_cat');
if ($subterm !== 0 && $subterm !== null) {
 	$subcat_ID_array = 	get_term_by( 'name', $subcat->Name, 'product_cat');
$subcat_ID = $subcat_ID_array->term_id;
} else {
 $subcat_name = $subcat->Name;
   $subcatid = wp_insert_term($subcat_name, 'product_cat');
	$subcat_ID = $subcatid['term_id'];
}
	 echo '<input type="checkbox" name="prod_category[]" checked value="'.$subcat_ID.'" ><label>'.$subcat->Name.'</label>';
	}

I am getting an error on the line = $cat_ID = $catid[‘term_id’];

Fatal error: Cannot use object of type WP_Error as array in…..formsubmission.php on line 226

Can anyone point me in the right direction please ?