Fatal Exception: java.lang.NullPointerException: Action.act(float) on a null object reference

Issue details

Crash appears while rendering screen.

Reproduction steps/code

StageScreen

public void render(float delta) {
        Gdx.gl.glClear(16384);
        if(null != this.stage) {
            this.stage.act(delta);
            this.stage.draw();
        }

    }

BaseScreen

 @Override
    public void render(float delta) {
        super.render(delta);
        if (null != fpsLabel) {
            fpsLabel.setText(String.valueOf(Gdx.graphics.getFramesPerSecond()));
        }
    }

BaseGame

public void render() {
        if(this.screen != null) {
            this.screen.render(Math.min(Gdx.graphics.getDeltaTime(), 0.033333335F));
        }
    }

Version of LibGDX and/or relevant dependencies

gdxVersion = ‘1.9.6’

Stacktrace

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean com.badlogic.gdx.scenes.scene2d.Action.act(float)' on a null object reference
       at com.badlogic.gdx.scenes.scene2d.actions.RepeatAction.delegate(SourceFile:29)
       at com.badlogic.gdx.scenes.scene2d.actions.DelegateAction.act(SourceFile:43)
       at com.badlogic.gdx.scenes.scene2d.Actor.act(SourceFile:96)
       at com.badlogic.gdx.scenes.scene2d.Group.act(SourceFile:49)
       at com.badlogic.gdx.scenes.scene2d.Group.act(SourceFile:49)
       at com.badlogic.gdx.scenes.scene2d.Stage.act(SourceFile:221)
       at ....StageScreen.render(SourceFile:98)
       at ....BaseScreen.render(SourceFile:71)
       at ....BaseGame.render(SourceFile:97)
       at com.badlogic.gdx.backends.android.AndroidGraphics.onDrawFrame(SourceFile:459)
       at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1583)
       at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1286)

Please select the affected platforms

• Android
• iOS (robovm)
• iOS (MOE)
• HTML/GWT
• Windows
• Linux
• MacOS

[julienvillegas]

oups! good point

[Darkyenus]

Provided code can’t cause your crash. Somewhere in your code, you must be adding RepeatAction with null action to repeat. This could be caused by releasing the RepeatAction back to its pool without actually removing it from the Actor. (Or maybe you are adding single RepeatAction instance to multiple Actors).

Anyway, this does not appear to be a libGDX problem, so it would be more suited for the forum or IRC.