Getting error of Cannot read properties of undefined (reading 'length') in stacked charts

Hey @Jamie_Buck-Tomek, thanks for reporting this issue. I did some testing and so far I haven’t been able to reproduce the issue where stacked column charts aren’t working in Lightning in 16.1.4.

Here’s the page I’m using.

<skuid__page unsavedchangeswarning="yes" personalizationmode="server" showsidebar="false" showheader="false">
		<model id="Opportunities" limit="" query="true" createrowifnonefound="false" datasource="salesforce" sobject="Opportunity">
				<field id="Amount"/>
				<field id="StageName"/>
				<field id="IsClosed"/>
				<field id="CloseDate"/>
		<skuid__chart model="Opportunities" maintitle="{{Model.labelPlural}}" type="column" uniqueid="sk-WPK-12885" stacking="true">
				<axis id="axis1" title="Amount"/>
				<axis id="categories" categorytype="field" field="CloseDate" fillvals="true" dategranularity="calmonth"/>
				<series valuefield="Amount" splittype="field" modelId="Opportunities" categoryField="CloseDate" splitfield="StageName"/>
			<legend layout="horizontal" halign="center" valign="bottom"/>

Let me know if there’s anything I’m missing… It looks like the chart is in a Skuid tab in a LIghtning tab? If you’re able to create a simplified version of your page that we can use for testing, that would be great. Check out this post for tips: How to create a good test page.