Mouse click detected twice on UI eventsystem

Unity Engine
, ,
1

Hi everyone,
I am building a little dialogue system using the new input system. I have a system of buttons which are populated dynamically with the options (using Ink for this, but it’s not the issue).
I set up my actions by binding the mouse click and space key to the Click action. I have set up the UI event system and I have put on my storyManager object the Player input component set to read the UI section of my event map.
Problem is, everytime I click the button, the onclick event fires twice, causing an exception in the engine.
Here is the code I use to set a listener up in my button:

 Choice choice = story.currentChoices[i];
                _buttons[i].interactable = true;
                _buttonLabels[i].text = choice.text.Trim();
                _buttons[i].onClick.AddListener(delegate
                {
                    OnClickChoiceButton(choice);
                });

If I debug.log the method OnClickChoicebutton I can see that everytime I click the code runs twice.

void OnClickChoiceButton (Choice choice)
    {
        //_optionsPresented = false;
        Debug.Log(choice.index);
        Debug.Log(_optionsPresented);
        setUIElement(_dialogueGroup,true);
        setUIElement(_optionsGroup, false);
        story.ChooseChoiceIndex (choice.index);
        RefreshStory();
    }

Why it happens? Is it normal? I cannot find a way to have the mouse click work only once.
Help?

2

Are you sure the event onClick is fired once, not twice? Is there a active property of the captured event that gets value 0 or 1 for Click on and Click release?
Are you sure you have one button, not two in the same position?
Try to bind static OnClickChoiceButton and use passed sender parameter.
Try to debug and check call stack.

Or maybe you’ve already solved that issue?