Content Groups and assigned Role permissions

<section class="widget">
	<header>
		<h1>Content Groups and assigned Role permissions</h1>
	</header>
	<main>
		<div class="row">
			<div>
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Call Stack:
    0.0001     359896   1. {main}() /volume1/web/packages/system/panels/cms/080_users/020_permissions/groups.tpl.php:0


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Call Stack:
    0.0001     359896   1. {main}() /volume1/web/packages/system/panels/cms/080_users/020_permissions/groups.tpl.php:0


Fatal error: Uncaught Error: Call to a member function toGroupList() on null in /volume1/web/packages/system/panels/cms/080_users/020_permissions/groups.tpl.php on line 7

Error: Call to a member function toGroupList() on null in /volume1/web/packages/system/panels/cms/080_users/020_permissions/groups.tpl.php on line 7

Call Stack:
    0.0001     359896   1. {main}() /volume1/web/packages/system/panels/cms/080_users/020_permissions/groups.tpl.php:0