diff --git a/code/game/turfs/turf.dm b/code/game/turfs/turf.dm
index 8e28c283358..df8ae690ad0 100644
--- a/code/game/turfs/turf.dm
+++ b/code/game/turfs/turf.dm
@@ -176,6 +176,8 @@
 
 	for(var/T in atmos_adjacent_turfs)
 		var/turf/open/S = T
+		if(!S.air)
+			continue
 		var/list/S_gases = S.air.gases
 		for(var/id in S_gases)
 			total.assert_gas(id)