Invalid Bitmap Error when removing glow Filter from a FlxSprite

• Haxe version: 3.3.0-RC1
• Flixel version: 4.2.0
• OpenFL version: 3.6.1
• Lime version: 2.9.1
• Affected targets: Flash

Code snippet reproducing the issue:

package;

import flixel.FlxG;
import flixel.FlxSprite;
import flixel.FlxState;
import flixel.graphics.FlxGraphic;
import flixel.system.FlxAssets.GraphicLogo;
import flixel.graphics.frames.FlxFilterFrames;
import flash.filters.BitmapFilter;
import flash.filters.GlowFilter;


/**
 * Test project for button glow filter.
 * Press "G" on the keyboard to toggle the glow over the flixel icon.
 * Removing the glow without the presence of the buffer sprite causes an Invalid Bitmap Error.
 * Written by sano98.
 * 
 */

 
class PlayState extends FlxState
{
	/**
	 * The test sprite. Press "G" to give it a glow, and again to remove it.
	 */
	public var testIcon:FlxSprite;
	
	
	/**
	 * The "buffer sprite". It's presence keeps the bug from happening.
	 */
	public var testIcon2:FlxSprite;
	
	/**
	 * Glow Filter for the flixel icon
	 */
	public var glowFilter:GlowFilter;
	public var filterFrame:FlxFilterFrames;
	
	
	
	
	override public function create():Void
	{
		FlxG.worldBounds.set( 0, 0, 640, 480); 
		FlxG.camera.setScrollBoundsRect(0, 0, 640, 480, false);
		
		
		super.create();
		
		this.bgColor = 0xFF77AAFF;
		
		this.testIcon = new FlxSprite(300, 300, FlxGraphic.fromClass(GraphicLogo));
		this.add(this.testIcon);
		
		
		//Comment this line out to reproduce the bug.
		this.testIcon2 = new FlxSprite(300, 300, FlxGraphic.fromClass(GraphicLogo));
		
		
		this.glowFilter = new GlowFilter(0xFFFFFFFF, 0.8, 5, 5, 3);
		this.filterFrame = this.createFilterFrames(this.testIcon);
		

		
	}
	
	
	private function createFilterFrames(sprite:FlxSprite):FlxFilterFrames
	{ 
		var filterFrames = FlxFilterFrames.fromFrames(sprite.frames, 5, 5, []); 
		return filterFrames; 
	} 
	
	
	function updateFilter(spr:FlxSprite, sprFilter:FlxFilterFrames)
	{
		sprFilter.applyToSprite(spr, false, true);
	}
	

	
	override public function update(elapsed:Float):Void
	{
		super.update(elapsed);
		
		
		
		if (FlxG.keys.justPressed.G)
		{
			if (this.filterFrame.filters.length > 0)
			{
				this.filterFrame.clearFilters();
				this.updateFilter(testIcon, this.filterFrame);
			}
			else
			{
				this.filterFrame.addFilter(glowFilter);
				this.updateFilter(testIcon, this.filterFrame);
			}
		}
	}
}

Observed behavior:
When the testIcon2 is not initialised, the code crashs with an invalid bitmap error when pressing the "G"-Button on the keyboard for the second time.

Expected behavior:
Pressing G should simply toggle the glow.

Reproduce the Flash-target failure with the supplied PlayState snippet, focusing on FlxFilterFrames.clearFilters(), applyToSprite(), and the FlxSprite frames used by testIcon. Verify that pressing G twice toggles the glow without an Invalid Bitmap error, both with and without testIcon2 initialized.