diff --git a/src/modules/Base.ts b/src/modules/Base.ts
index 9d42f79..e613ffe 100644
--- a/src/modules/Base.ts
+++ b/src/modules/Base.ts
@@ -120,6 +120,8 @@ export abstract class BaseModule extends FindOrCreate {
           case 'String':
             if (typeof params[key] === 'object') {
               opt[key] = params[key]
+            } else if (key === 'chain') {
+              opt[key] = params[key] + ''
             } else {
               opt[key] = { $regex: params[key], $options: 'i' }
             }