E Warning Template Errors

Seeing a bunch of these in admin logs. Not sure how to fix this.

Code:

ErrorException: Template error: [E_WARNING] Trying to access array offset on null
internal_data/code_cache/templates/l1/s0/admin/PAGE_CONTAINER.php:219

Stack trace
#0 internal_data/code_cache/templates/l1/s0/admin/PAGE_CONTAINER.php(219): XF\Template\Templater->handleTemplateError(2, '[E_WARNING] Try...', '/home/cazzy04/p...', 219)
#1 src/XF/Template/Templater.php(1654): XF\Template\Templater->{closure}(Object(XF\Template\Templater)...

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