diff --git a/code/WorkInProgress/Chinsky/guestpass.dm b/code/WorkInProgress/Chinsky/guestpass.dm
index e6a9d860ded..e29b63db6bb 100644
--- a/code/WorkInProgress/Chinsky/guestpass.dm
+++ b/code/WorkInProgress/Chinsky/guestpass.dm
@@ -120,11 +120,12 @@
 				var/reas = input("Reason why pass is issued", "Reason", reason)
 				reason = strip_html_simple(reas)
 			if ("duration")
-				var/dur = input("Duration (in minutes) during which pass is valid.", "Duration") as num
-				if (dur > 0 && dur < 30)
-					duration = dur
-				else
-					usr << "<span class='warning'>Invalid duration.</span>"
+				var/dur = input("Duration (in minutes) during which pass is valid (up to 30 minutes).", "Duration") as num|null
+				if (dur)
+					if (dur > 0 && dur <= 30)
+						duration = dur
+					else
+						usr << "<span class='warning'>Invalid duration.</span>"
 			if ("access")
 				var/A = text2num(href_list["access"])
 				if (A in accesses)