diff --git a/Classes/Service/DatabaseStorageService.php b/Classes/Service/DatabaseStorageService.php
index 48ef043..59a0dd1 100644
--- a/Classes/Service/DatabaseStorageService.php
+++ b/Classes/Service/DatabaseStorageService.php
@@ -293,6 +293,12 @@ protected function getStringValue($value, int $indent = 0): string
         if (is_string($value)) {
             return $value;
         }
+        if (is_numeric($value)) {
+            return (string) $value;
+        }
+        if (is_bool($value)) {
+            return ($value ? 'true' : 'false');
+        }
         if (is_object($value) && method_exists($value, '__toString')) {
             return (string)$value;
         }