diff --git a/code/game/objects/items/devices/forcefieldprojector.dm b/code/game/objects/items/devices/forcefieldprojector.dm
index 86e98aef93..65b0243438 100644
--- a/code/game/objects/items/devices/forcefieldprojector.dm
+++ b/code/game/objects/items/devices/forcefieldprojector.dm
@@ -34,6 +34,10 @@
 	if(LAZYLEN(current_fields) >= max_fields)
 		to_chat(user, "<span class='notice'>[src] cannot sustain any more forcefields!</span>")
 		return
+	var/obj/structure/projected_forcefield/F = locate() in T
+	if(F)
+		to_chat(user, "<span class='notice'>There is already a forcefield on [T]!</span>")
+		return
 
 	playsound(src,'sound/weapons/resonator_fire.ogg',50,1)
 	user.visible_message("<span class='warning'>[user] projects a forcefield!</span>","<span class='notice'>You project a forcefield.</span>")