Merge pull request #742 from backerclub/bugfix/explode-warning

Fix warning from passing null to explode for includeParts

Author: freekmurze

src/QueryBuilderRequest.php

@@ -38,8 +38,8 @@ public function includes(): Collection
 
         $includeParts = $this->getRequestData($includeParameterName);
 
-        if (! is_array($includeParts)) {
-            $includeParts = explode(static::getIncludesArrayValueDelimiter(), $this->getRequestData($includeParameterName));
+        if (is_string($includeParts)) {
+            $includeParts = explode(static::getIncludesArrayValueDelimiter(), $includeParts);
         }
 
         return collect($includeParts)->filter();