Why does Call to a member function find() on null error occur?

Question

PHP

The error constantly occurs on different products, but always on this line $characteristic = $a2->find('.product_short_info_parametr', 0)->find('span');

$html_arr_p1 = $html1->find('.items_catalog_one_item');
    foreach ($html_arr_p1 as $a2) {		
      $characteristic = $a2->find('.product_short_info_parametr', 0)->find('span');
                        {

I don't understand what could be wrong

Answer 1

obviously because find returned null, and you treat it as an object, try at least like this

$characteristic = ($t = $a2->find('.product_short_info_parametr', 0)) ? $t->find('span') : null;

Answer 2

You are trying in your code to work with an object whose reference is null. Either change the logic of the code, or at least set the check for the objects used in the code to null.

Answer 3

Because $a2 is empty
Do a type check

if($a2) {
$characteristic = $a2->find('.product_short_info_parametr', 0)->find('span');
}

Or something like that (isset or something else - I don’t remember offhand how it would be more correct there))