# NullReferenceException in Unity **URL:** \ **Category:** Unity SDK\ **Tags:** question, unity, bug\ **Created:** [February 4, 2025, 4:03pm UTC](https://forum.convai.com/t/nullreferenceexception-in-unity/2818 "2025-02-04T16:03:35Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![info\_AM](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/info_am/32/2984_2.png) [@info\_AM](https://forum.convai.com/u/info_AM)\ **Post date:** [February 4, 2025, 4:03pm UTC](https://forum.convai.com/t/nullreferenceexception-in-unity/2818/1 "2025-02-04T16:03:35Z")
Hi there, I found a NullReferenceException in Unity: `NullReferenceException: Object reference not set to an instance of an object Convai.Scripts.Runtime.UI.ChatUIBase.DeactivateUI () (at Assets/Convai/Scripts/Runtime/UI/Chat/ChatUIBase.cs:60)` I could fix it by using ‘?’: `UIStatusChange?.Invoke(false);` That is also used in line 50. So I assume that is the correct fix?! Thanks Rainer ---
**Author:** ![K3](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/k3/32/2611_2.png) [@K3](https://forum.convai.com/u/K3)\ **Post date:** [February 6, 2025, 8:34am UTC](https://forum.convai.com/t/nullreferenceexception-in-unity/2818/2 "2025-02-06T08:34:06Z")
Hello @info_AM, How did this issue occur? Did you modify any scripts or make changes to the **Convai Essentials Prefabs**? ---
**Author:** ![info\_AM](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/info_am/32/2984_2.png) [@info\_AM](https://forum.convai.com/u/info_AM)\ **Post date:** [February 6, 2025, 9:09am UTC](https://forum.convai.com/t/nullreferenceexception-in-unity/2818/3 "2025-02-06T09:09:28Z")
Hi @K3 , I have an “edit” / Admin mode in my app, where I want to hide the convai UI. I use this code and then it happens when I want to deactivate the UI: ```auto public void SetState(bool state) { _convaiInputManager.enabled = state; _convaiUI.SetActive(state); if (ConvaiChatUIHandler.Instance == null) { Debug.LogWarning("ConvaiChatUIHandler component not found!"); return; } // Hide the ConvaiChatUIHandler currentUI IChatUI iChatUI = ConvaiChatUIHandler.Instance.GetCurrentUI(); if (iChatUI != null) { if (state) { iChatUI.ActivateUI(); } else { iChatUI.DeactivateUI(); } } else { Debug.LogWarning("IChatUI component not found!"); } } ``` ---
**Author:** ![K3](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/k3/32/2611_2.png) [@K3](https://forum.convai.com/u/K3)\ **Post date:** [February 7, 2025, 12:00pm UTC](https://forum.convai.com/t/nullreferenceexception-in-unity/2818/4 "2025-02-07T12:00:42Z")
Could you please share your UI design? ---
**Author:** ![info\_AM](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/info_am/32/2984_2.png) [@info\_AM](https://forum.convai.com/u/info_AM)\ **Post date:** [February 7, 2025, 1:50pm UTC](https://forum.convai.com/t/nullreferenceexception-in-unity/2818/5 "2025-02-07T13:50:10Z")
Hi, I´m not sure why you would need that. My post is just about a bug I found. I thinks it’s save to use my fix in my project and you should apply the fix to the codebase in general. I sent this info via email before. I got an answer that I should post it here. Please forward it to a developer. They will know if / what to apply. Some background: I want to position colliders in the room. Therefore I have an admin mode where I can place Spatial Anchors (meta Quest 3 is used). In this mode I disable convai and the convai UI. Therefore I created the function posted in my last reply. Thanks Rainer ---
**Author:** ![K3](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/k3/32/2611_2.png) [@K3](https://forum.convai.com/u/K3)\ **Post date:** [February 7, 2025, 2:05pm UTC](https://forum.convai.com/t/nullreferenceexception-in-unity/2818/6 "2025-02-07T14:05:34Z")
Hello, This event is used by **ConvaiLogoHandler**. If you have removed the **Convai logo** , this issue may occur. The logo can only be removed if your plan is **Annual Scale or higher**. For account, billing, or plan-related issues, support email is available only for those inquiries. Thank you for your feedback! I will share this with our team. ---
**Author:** ![info\_AM](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/info_am/32/2984_2.png) [@info\_AM](https://forum.convai.com/u/info_AM)\ **Post date:** [February 7, 2025, 6:13pm UTC](https://forum.convai.com/t/nullreferenceexception-in-unity/2818/7 "2025-02-07T18:13:05Z")
Hi, no I didn’t do anything to the logo or so. I just found this functionality to hdie the current UI prefab which is visible by getting it with `IChatUI iChatUI = ConvaiChatUIHandler.Instance.GetCurrentUI();` and then hiding the complete UI prefab / gameobject with `iChatUI.DeactivateUI();` Cheers Rainer ---
**Author:** ![K3](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/k3/32/2611_2.png) [@K3](https://forum.convai.com/u/K3)\ **Post date:** [February 7, 2025, 7:28pm UTC](https://forum.convai.com/t/nullreferenceexception-in-unity/2818/8 "2025-02-07T19:28:14Z")
Thanks for sharing the details! I’ll share these details with our team. Let us know if you have any other questions! ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex004/uploads/convai/original/1X/e60ef96aa7334c5ccf6682f6c6dbc20fcfa96b49.png) [@system](https://forum.convai.com/u/system)\ **Post date:** [March 9, 2025, 7:28pm UTC](https://forum.convai.com/t/nullreferenceexception-in-unity/2818/9 "2025-03-09T19:28:37Z")
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