Hello I have one error returned if the suggestion array is empty here:

if ($filter = $this->getFilterMatch($suggestion)) {

I solve the problem like this

if ( count($suggestion) != 0 && $filter = $this->getFilterMatch($suggestion)) {

Thanks for this module !

Running configuration inspector inspect over a created view

using this module indicated that there was missing schema information.

After patching the schema with attached file, the configuration inspector did not report any errors for this field.

I have placed the patch file in zip archive so that it can be uploaded.

search_api_spellcheck-missing_schema_information-1-D8.zip

First of all, thank you for your contribution.

Secondly i have had some problems with this module and it only started working after i have added new hook in my custom module.

function MYMODULE_search_api_solr_query_alter(\Solarium\Core\Query\QueryInterface $solarium_query, \Drupal\search_api\Query\QueryInterface $query) {
  $solarium_query->addParam('spellcheck', 'on');
}

Is there something i missed while configuring it, or it does not work by itself?

Thirdly, are you planning to add it to contrib modules? The spelling suggestions is something many people might need.