When an ongoing tween is happening while an object is destroyed, an error is logged - with no way to disable?

[coty-crg]

Sorry if I'm missing something. I've noticed that .OnComplete() always has a "warn if null" flag; which i always set to false (i wish this was the default).

However, I frequently have UI tweens which are ongoing when a UI panel is destroyed. I could keep track of these and kill manually, I know. But coming from DoTween, I didn't have to there, so why do I have to now? If there was at least a flag I'd set it every time, "kill tween if target is null" or something. I don't care if it's null checking every frame, that's fine in this case.

Tween's target is null:  / Vector2 / duration 0.25 / id 419. This error can mean that:
- The target reference is null.
- UnityEngine.Object target reference is not populated in the Inspector.
- UnityEngine.Object target has been destroyed.
Please ensure you're using a valid target.

UnityEngine.Debug:LogError (object)
PrimeTween.PrimeTweenManager:addTween_internal (PrimeTween.ReusableTween) (at ./Packages/com.kyrylokuzyk.primetween/Runtime/Internal/PrimeTweenManager.cs:317)
PrimeTween.PrimeTweenManager:addTween (PrimeTween.ReusableTween) (at ./Packages/com.kyrylokuzyk.primetween/Runtime/Internal/PrimeTweenManager.cs:310)
PrimeTween.PrimeTweenManager:Animate (PrimeTween.ReusableTween) (at ./Packages/com.kyrylokuzyk.primetween/Runtime/Internal/PrimeTweenManager.cs:290)
PrimeTween.Tween:animate (object,PrimeTween.TweenSettings`1<UnityEngine.Vector2>&,System.Action`1<PrimeTween.ReusableTween>,System.Func`2<PrimeTween.ReusableTween, PrimeTween.ValueContainer>) (at ./Packages/com.kyrylokuzyk.primetween/Runtime/Internal/TweenGenerated.cs:2019)
PrimeTween.Tween:UISizeDelta (UnityEngine.RectTransform,PrimeTween.TweenSettings`1<UnityEngine.Vector2>) (at ./Packages/com.kyrylokuzyk.primetween/Runtime/Internal/TweenGenerated.cs:1233)
PrimeTween.Tween:UISizeDelta 
...

[KyryloKuzyk]

It is safe to destroy objects with running tweens, and there is no need to Stop() tweens manually before destroying an object or unloading a scene. Here is a separate article on this topic: #4

The error you get appears when you pass null (or destroyed) target to Tween.UISizeDelta() method. So to "disable" the error you need to check whether RectTransform != null. Or better: understand why RectTransform is null because this error typically indicates a bug in the user's code.

If you get this error only when you destroy your UI panel, I assume you're trying to start an animation when the RectTransform has already been destroyed. A full stack trace can help understand what's happening exactly.