Hi, we noticed a problem with the Advanced Color Picker and here is the patch. Not sure if a null check is the answer but it fixed our problem
	
							
						
					Code:
	
		//null check for advanced color picker
	if (window.isc &&  isc.version.startsWith("v8.3")){
		
		isc.ColorPicker.getPrototype().addProperties({
			$564:function isc_ColorPicker__changeColor(_1){if(_1=='rgb'){var _2=isc.ColorUtils.rgbToHsl(this.$56j,this.$56k,this.$56l);this.$56f=false;this.setHue(_2.h);this.setSaturation(_2.s);this.setLuminosity(_2.l,true);this.setHtmlColor(isc.ColorUtils.rgbToHtml(this.$56j,this.$56k,this.$56l));this.$56f=true;this.$563(this.$56o,this.$56p)}else if(_1=='hsl'){if(!this.$105z)this.$56q=120;var _3=isc.ColorUtils.hslToRgb(this.$56o,this.$56p,this.$56q);this.$56f=false;this.setRed(_3.r);this.setGreen(_3.g);this.setBlue(_3.b);this.setHtmlColor(isc.ColorUtils.rgbToHtml(this.$56j,this.$56k,this.$56l));this.$56f=true;if(this.$56o!=this.$565||this.$56p!=this.$566){this.$563(this.$56o,this.$56p)}}else if(_1=='html'){var _3=isc.ColorUtils.htmlToRgb(this.$56m);this.$56f=false;this.setRed(_3.r);this.setGreen(_3.g);this.setBlue(_3.b);var _2=isc.ColorUtils.rgbToHsl(this.$56j,this.$56k,this.$56l);this.setHue(_2.h);this.setSaturation(_2.s);this.setLuminosity(_2.l,true);this.$56f=true;this.$563(this.$56o,this.$56p)}
			if(this.$56c=='complex'){this.$56x.setValue(this.$56q);this.$56n.setValue("pickerLumVal",this.$56q)}
			if(this.$56c=='complex'){this.$56u.setBackgroundColor(isc.ColorUtils.hslToHtml(this.$56o,this.$56p,this.$56q))}
			if(this.$56o!=this.$565||this.$56p!=this.$566){this.$56h()}
			if(this.$56c=='complex'){
				this.$56u.setOpacity(this.$56d);
				var _4=this.$56y
				//4/18/13
				//added null check here to avoid script error
				if(_4!=null){
					var _5=_4.getValue()
					var _6=this.$56d;					
					if(_6===null)_6=100;
					if(_5!=_6)this.$56y.setValue(this.$56d)
				}
			}
			this.$565=this.$56o;this.$566=this.$56p;if(this.colorChanged)this.colorChanged()}
		})
		
	}

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