Index: Classes/Settings/Type/IntType.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/Classes/Settings/Type/IntType.php b/Classes/Settings/Type/IntType.php
--- a/Classes/Settings/Type/IntType.php	
+++ b/Classes/Settings/Type/IntType.php	(date 1731503053539)
@@ -47,7 +47,11 @@
     {
         if (!$this->validate($value, $definition)) {
             $this->logger->warning('Setting validation field, reverting to default: {key}', ['key' => $definition->key]);
-            return $definition->default;
+            if (!is_scalar($definition->default)) {
+                $this->logger->warning("Invalid default value ".$definition->default." for site settins definition " . $definition->key);
+                return 0;
+            }
+            return (int) $definition->default;
         }
 
         return (int)$value;