Deprecated Functionality: explode(): Passing null to parameter #2 ($string)

Question

I have an issue ; Deprecated Functionality: explode(): Passing null to parameter #2 ($string). Can you please help?

 public function getEnabled()
{
 return $this->_dataHelper->getEnabled();
}
public function getRenderableAttributes()
{
 if (!$this->getEnabled()) {
 return [];
 }
 $attributeCode = $this->_dataHelper->getAttributeCode();
 $product = $this->getProduct();
 $selectedFeaturesRaw = $product->getData($attributeCode);
 $selectedFeaturesSplit = explode(',', $selectedFeaturesRaw);
 $attr = $product->getResource()->getAttribute($attributeCode);
 $selectedFeatures = [];
 foreach ($selectedFeaturesSplit as $selectedFeatureCode) {
 if ($attr->usesSource()) {
 $selectedFeatures[] = $attr->getSource()->getOptionText($selectedFeatureCode);
 }
 }
 if (empty($selectedFeatures)) {
 return [];
 }
 $features = [];
 $searchCriteria = $this->_searchCriteriaBuilder->addFilter('attribute_value', $selectedFeatures, 'in')->create();
 $searchResults = $this->_dataRepository->getList($searchCriteria);
 $features = array_map(function ($feature) {
 return $feature->getData();
 }, $searchResults->getItems());
 return $features;
}

Answer 1

Replace your code selectedFeaturesRaw = $product->getData($attributeCode);
with
$selectedFeaturesRaw = $product->getData($attributeCode) ?: '';

Finally, your code should look like the following:

public function getEnabled()
{
 return $this->_dataHelper->getEnabled();
}
public function getRenderableAttributes()
{
 if (!$this->getEnabled()) {
 return [];
 }
 $attributeCode = $this->_dataHelper->getAttributeCode();
 $product = $this->getProduct();
 $selectedFeaturesRaw = $product->getData($attributeCode) ?: '';
 $selectedFeaturesSplit = explode(',', $selectedFeaturesRaw);
 $attr = $product->getResource()->getAttribute($attributeCode);
 $selectedFeatures = [];
 foreach ($selectedFeaturesSplit as $selectedFeatureCode) {
 if ($attr->usesSource()) {
 $selectedFeatures[] = $attr->getSource()->getOptionText($selectedFeatureCode);
 }
 }
 if (empty($selectedFeatures)) {
 return [];
 }
 $features = [];
 $searchCriteria = $this->_searchCriteriaBuilder->addFilter('attribute_value', $selectedFeatures, 'in')->create();
 $searchResults = $this->_dataRepository->getList($searchCriteria);
 $features = array_map(function ($feature) {
 return $feature->getData();
 }, $searchResults->getItems());
 return $features;
}

Answer 2

Change below line.

 $selectedFeaturesSplit = explode(',', (string)$selectedFeaturesRaw);