Index: modules/contrib/search_api_attachments/src/Plugin/search_api/processor/FilesExtrator.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- modules/contrib/search_api_attachments/src/Plugin/search_api/processor/FilesExtrator.php	(revision )
+++ modules/contrib/search_api_attachments/src/Plugin/search_api/processor/FilesExtrator.php	(revision )
@@ -500,7 +500,7 @@
     else {
 
       if (!$extensions) {
-        $extensions = $this->defaultExcludedExtensions();
+        $extensions = explode(' ',$this->defaultExcludedExtensions());
       }
       $excluded_mimes = [];
       foreach ($extensions as $extension) {