diff --git a/code/game/gamemodes/colonialmarines/colonialmarines.dm b/code/game/gamemodes/colonialmarines/colonialmarines.dm
index 7851b3b48644..5e3f55072ddb 100644
--- a/code/game/gamemodes/colonialmarines/colonialmarines.dm
+++ b/code/game/gamemodes/colonialmarines/colonialmarines.dm
@@ -190,6 +190,8 @@
 
 ///Creates an OB warning at each LZ to warn of the miasma and then spawns the miasma
 /datum/game_mode/colonialmarines/proc/start_lz_hazards()
+	if(SSobjectives.first_drop_complete)
+		return // Just for sanity
 	INVOKE_ASYNC(src, PROC_REF(warn_lz_hazard), locate(/obj/structure/machinery/computer/shuttle/dropship/flight/lz1))
 	INVOKE_ASYNC(src, PROC_REF(warn_lz_hazard), locate(/obj/structure/machinery/computer/shuttle/dropship/flight/lz2))
 	addtimer(CALLBACK(src, PROC_REF(spawn_lz_hazards)), OB_TRAVEL_TIMING + 1 SECONDS)