diff --git a/src/types.ts b/src/types.ts
index de306a6..082bd6d 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -47,6 +47,18 @@ export enum TYPE {
     NULL = 'NULL',
 }
 
+const constructorOf = (value: object): unknown => {
+    return Object.getPrototypeOf(value).constructor
+}
+
+export function isRecord (value: object): boolean {
+    return constructorOf(value) === Object && Object.keys(Object.getPrototypeOf(value)).length === 0
+}
+
+export function isRecordLike (value: unknown): boolean {
+    return typeof value === 'object' && value !== null && (isRecord(value) || Array.isArray(value))
+}
+
 export function typeOf (value: unknown): string {
     switch (typeof value) {
         case 'bigint':
@@ -76,20 +88,16 @@ export function typeOf (value: unknown): string {
                 return TYPE.ARRAY
             }
 
-            if (value.constructor.name === 'Object') {
+            if (isRecord(value)) {
                 return TYPE.RECORD
             }
 
-            return 'InstanceOf<' + value.constructor.name + '>'
+            return 'InstanceOf<' + (constructorOf(value) as { name?: string }).name + '>'
     }
 
     throw new Error()
 }
 
-export function isRecordLike (value: unknown): boolean {
-    return typeof value === 'object' && value !== null && ['Array', 'Object'].includes(value.constructor.name)
-}
-
 export function isScalar (value: unknown): boolean {
     switch (typeof value) {
         case 'bigint':
diff --git a/test/unit/types.test.js b/test/unit/types.test.js
index d7d5eae..3a8d2c1 100644
--- a/test/unit/types.test.js
+++ b/test/unit/types.test.js
@@ -15,6 +15,7 @@ describe('types', () => {
 
     const records = [
         [{}],
+        [{ constructor: null }],
         [{ a: 'a', b: ['b'] }],
         [[]],
         [['b', 'c']],