diff --git a/pkg/module/auth/module.go b/pkg/module/auth/module.go
index 8705f93..4d8fd4d 100644
--- a/pkg/module/auth/module.go
+++ b/pkg/module/auth/module.go
@@ -55,7 +55,7 @@ func (m *Module) getClaim(call goja.FunctionCall, rt *goja.Runtime) goja.Value {
 }
 
 func ModuleFactory(funcs ...OptionFunc) app.ServerModuleFactory {
-	opt := &Option{}
+	opt := defaultOptions()
 	for _, fn := range funcs {
 		fn(opt)
 	}
diff --git a/pkg/module/auth/option.go b/pkg/module/auth/option.go
index fa2a375..fe63999 100644
--- a/pkg/module/auth/option.go
+++ b/pkg/module/auth/option.go
@@ -3,6 +3,8 @@ package auth
 import (
 	"context"
 	"net/http"
+
+	"github.com/pkg/errors"
 )
 
 type GetClaimFunc func(ctx context.Context, r *http.Request, claimName string) (string, error)
@@ -13,6 +15,16 @@ type Option struct {
 
 type OptionFunc func(*Option)
 
+func defaultOptions() *Option {
+	return &Option{
+		GetClaim: dummyGetClaim,
+	}
+}
+
+func dummyGetClaim(ctx context.Context, r *http.Request, claimName string) (string, error) {
+	return "", errors.Errorf("dummy getclaim func cannot retrieve claim '%s'", claimName)
+}
+
 func WithGetClaim(fn GetClaimFunc) OptionFunc {
 	return func(o *Option) {
 		o.GetClaim = fn