Fixed possible crash on node.to() method. close #1944

CHANGELOG.md

@@ -3,6 +3,10 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## 9.3.22 (2025-07-08)
+
+- Fixed possible crash on `node.to()` method
+
 ## 9.3.21 (2025-07-07)
 
 - Fixed memory leaks on Tween destroy

src/Tween.ts

@@ -530,11 +530,13 @@ export class Tween {
     delete Tween.attrs[nodeId][thisId];
 
     // Clean up parent objects if empty
-    if (Object.keys(Tween.tweens[nodeId]).length === 0) {
-      delete Tween.tweens[nodeId];
-    }
-    if (Object.keys(Tween.attrs[nodeId]).length === 0) {
-      delete Tween.attrs[nodeId];
+    if (Tween.tweens[nodeId]) {
+      if (Object.keys(Tween.tweens[nodeId]).length === 0) {
+        delete Tween.tweens[nodeId];
+      }
+      if (Object.keys(Tween.attrs[nodeId]).length === 0) {
+        delete Tween.attrs[nodeId];
+      }
     }
   }
 }

test/unit/Tween-test.ts

@@ -257,6 +257,34 @@ describe('Tween', function () {
     });
   });
 
+  it('to method double simple usage', function (done) {
+    var stage = addStage();
+
+    let finishCount = 0;
+    const onFinish = () => {
+      if (finishCount === 2) {
+        done();
+      }
+    };
+    stage.to({
+      x: 10,
+      duration: 0.001,
+      onFinish: () => {
+        assert(stage.x() === 10);
+        finishCount += 1;
+        onFinish();
+      },
+    });
+    stage.to({
+      y: 10,
+      duration: 0.001,
+      onFinish: () => {
+        finishCount += 1;
+        onFinish();
+      },
+    });
+  });
+
   it('tween to call update callback', function (done) {
     var stage = addStage();
     var updateCount = 0;
@@ -303,6 +331,8 @@ describe('Tween', function () {
 
     line.to({
       points: [100, 100, 200, 100, 200, 200, 100, 200],
+      // add another attribute for better test of cleanup
+      x: 10,
       duration: 0.1,
       onFinish: function () {
         assert.deepEqual(