Simple search error when no results found

I’m using simple search with EE 5.2.1. Searches work fine when there is a matching result, but I get the following error when no results are found. I do have a no results page specified.

Warning array_unique() expects parameter 1 to be array, null given ee/EllisLab/Addons/search/mod.search.php, line 1147

Severity: E_WARNING Warning count(): Parameter must be an array or an object that implements Countable ee/EllisLab/Addons/search/mod.search.php, line 1147

Severity: E_WARNING Warning Cannot modify header information - headers already sent by (output started at ee/legacy/core/Exceptions.php:120) ee/legacy/libraries/Functions.php, line 393

Severity: E_WARNING