How to fix «Call to a member function getItems() on null» for Amasty «Advanced Search»?

Administration Third-party extensions
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Locate the method \Amasty\Xsearch\Block\Search\Product::initializeProductCollection() and replace the code block

$this->_eventManager->dispatch(
	'catalog_block_product_list_collection',
	['collection' => $this->_productCollection]
);

with the following one:

$this->_eventManager->dispatch(
	'catalog_block_product_list_collection',
	['collection' => $collection]
);