diff --git a/code/modules/mob/mob.dm b/code/modules/mob/mob.dm
index 0109952c96e..ce64d9b7ee5 100644
--- a/code/modules/mob/mob.dm
+++ b/code/modules/mob/mob.dm
@@ -54,7 +54,7 @@
 
 	QDEL_NULL(ability_master)
 	QDEL_NULL(zone_sel)
-	if (length(machine?.climbers))
+	if (istype(machine, /obj/structure) && length(machine.climbers))
 		machine.climbers -= src
 	machine = null
 
diff --git a/html/changelogs/hellfirejag-another-human-harddel.yml b/html/changelogs/hellfirejag-another-human-harddel.yml
new file mode 100644
index 00000000000..23bcd734d7f
--- /dev/null
+++ b/html/changelogs/hellfirejag-another-human-harddel.yml
@@ -0,0 +1,4 @@
+author: Hellfirejag
+delete-after: True
+changes:
+  - bugfix: "Fixed yet another runtime error with humans that triggers hard deletes."