diff --git a/result.go b/result.go
index 4e2bfae..c6d3375 100644
--- a/result.go
+++ b/result.go
@@ -126,7 +126,7 @@
 	valueString := fmt.Sprintf("%v", v.value)
 
 	// marshal the go value value to json
-	if v.Value == nil {
+	if v.value == nil {
 		valueString = TYPE_NULL
 	} else {
 		if vs, err := marshalToJsonString(v.value); err == nil {