edit

src/Dever/Store/Mongo.php

@@ -356,7 +356,7 @@ class Mongo extends Base
     }
     private function value($key, $value)
     {
-        if ($key == '_id') {
+        if ($key == '_id' && !is_numeric($value)) {
             $value = new ObjectId($value);
         } elseif (is_numeric($value)) {
             $value = (float) $value;