Getting `Error evaluating injectedJavaScript` when changing scene with navigation

[Nesh108]

Hello,

I am constantly getting this error when moving back from a page to another:

Error evaluating injectedJavaScript: This is possibly due to an unsupported return type. Try adding true to the end of your injectedJavaScript string.

I noticed that this is an error coming from the webview: react-native-webview/react-native-webview#341

Is there anything we can do to fix it?

Here is my code:

initCanvas = (canvas) => {
        // making sure this is called only once
        if(!this.hasCanvasInited) {
            this.hasCanvasInited = true;
            var deltaTime = 100;
            // These are switched because of landscape mode
            canvas.width = this.window_size.height;
            canvas.height = this.window_size.width + 50;
            var context = canvas.getContext('2d');
            context.fillStyle = '#DDA0DD';
            context.fillRect(0, 0, canvas.width, canvas.height);
            context.save();

            // Wait few seconds before starting to avoid issues with canvas not being loaded yet
            setTimeout(() => {
                this.drawLoop(canvas, context, deltaTime);
            }, 1000);
        }
    }
    
    drawLoop = (canvas, context, deltaTime) => {
        if(canvas !== null) {
            context.restore();
            this.plotSine(context, 0, canvas.height / 2);
    
            setTimeout(() => {
                this.canvasTimer += deltaTime / 1000;
                this.drawLoop(canvas, context, deltaTime);
            }, deltaTime);
        }
    }
    
    plotSine = (ctx, x_offset, y_offset) => {
        var height = -125;
        var width = 100;
        this.drawCircle(ctx, x_offset + (this.canvasTimer * width), y_offset + (height * Math.sin(this.canvasTimer * (Math.PI / 2) - Math.PI * 0.5)), 30, 'purple', 'purple', 2);
    }
    
    drawCircle = (ctx, x, y, radius, fill, stroke, strokeWidth) => {
        console.log(x,y);
        ctx.beginPath()
        ctx.arc(x, y, radius, 0, 2 * Math.PI, false)
        if (fill) {
            ctx.fillStyle = fill
            ctx.fill()
        }
        if (stroke) {
            ctx.lineWidth = strokeWidth
            ctx.strokeStyle = stroke
            ctx.stroke()
        }
    }
    
    render() {
    return (
      <Canvas ref={this.initCanvas}/>
    )
  }