diff --git a/dynamic_struct.go b/dynamic_struct.go
index 428f00d..b0961de 100644
--- a/dynamic_struct.go
+++ b/dynamic_struct.go
@@ -24,6 +24,7 @@ func NewMap2DynamicStruct(mapData map[string]any, tagTable map[string]string) *D
 func NewDynamic() *DynamicStruct {
 	return &DynamicStruct{
 		structFieldList: make([]reflect.StructField, 0),
+		mapData:         make(map[string]any),
 	}
 }