Flaky test create_and_destroy: Cannot read null.len

[github-actions]

Flaky tests were detected in this test run. This means that there was a failure that was cleared when the tests were simply restarted.
Failures:

create_and_destroy: [18:12:47] Runtime in code/__HELPERS/spatial_info.dm,221: Cannot read null.len
proc name: mob only listeners (/proc/mob_only_listeners)
src: null
call stack:
mob only listeners(null)
the udder (/obj/item/udder): audible message("<span class=\'notice\'> The ic...", null, 7, null, 0, " ")
/datum/reagents (/datum/reagents): force stop reacting()
/datum/reagents (/datum/reagents): Destroy(0)
qdel(/datum/reagents (/datum/reagents), 0)
the udder (/obj/item/udder): Destroy(0)
the udder (/obj/item/udder): Destroy(0)
the udder (/obj/item/udder): Destroy(0)
the udder (/obj/item/udder): Destroy(0)
the udder (/obj/item/udder): Destroy(0)
...
/datum/component/udder (/datum/component/udder): Destroy(0)
qdel(/datum/component/udder (/datum/component/udder), 0)
the wisdom cow (/mob/living/basic/cow/wisdom): Destroy(1)
the wisdom cow (/mob/living/basic/cow/wisdom): Destroy(1)
the wisdom cow (/mob/living/basic/cow/wisdom): Destroy(1)
the wisdom cow (/mob/living/basic/cow/wisdom): Destroy(1)
the wisdom cow (/mob/living/basic/cow/wisdom): Destroy(1)
/datum/unit_test/create_and_de... (/datum/unit_test/create_and_destroy): Run()
RunUnitTests()
/datum/callback (/datum/callback): InvokeAsync() at code/__HELPERS/spatial_info.dm:221