diff --git a/src/typing/field.ts b/src/typing/field.ts
index 94c87de..305d886 100644
--- a/src/typing/field.ts
+++ b/src/typing/field.ts
@@ -22,7 +22,9 @@ export class Field extends DataClass implements Bindable<FieldBindingContext, Fi
         if (!this.type.context) {
             this.type = this.type.bind({ field: this });
         }
-        this.default = this.type.parseDefault(this.default);
+        if (this.default != null) {
+            this.default = this.type.parseDefault(this.default);
+        }
     }
 
     bind(context: FieldBindingContext) {