Update src/Actions/ResolveForPropertyValueAction.php

Co-authored-by: Tom Witkowski <dev.gummibeer@gmail.com>

src/Actions/ResolveForPropertyValueAction.php

@@ -34,6 +34,6 @@ protected function isValueAnEnum($value): bool
 
         $enumNamespace = is_object($value) ? get_class($value) : $value;
 
-        return ! is_array($value) && enum_exists((string) $enumNamespace);
+        return ! is_array($value) && is_string($enumNamespace) && enum_exists($enumNamespace);
     }
 }