sdfas (#18602)

code/modules/reagents/Chemistry-Machinery.dm

@@ -97,7 +97,8 @@
 		to_chat(user, "You [anchored ? "attach" : "detach"] the [src] [anchored ? "to" : "from"] the ground")
 		playsound(src.loc, attacking_item.usesound, 75, 1)
 
-	ui = SStgui.try_update_ui(user, src, ui)
+	if(ui?.user)
+		ui = SStgui.try_update_ui(user, src, ui)
 
 
 /obj/machinery/chem_master/ui_interact(mob/user, datum/tgui/ui)

code/modules/reagents/reagent_containers.dm

@@ -87,7 +87,7 @@
 	reagents.apply_force(speed)
 
 /obj/item/reagent_containers/proc/shatter(var/obj/item/W, var/mob/user)
-	if(reagents.total_volume)
+	if(reagents?.total_volume)
 		reagents.splash(src.loc, reagents.total_volume) // splashes the mob holding it or the turf it's on
 	audible_message(SPAN_WARNING("\The [src] shatters with a resounding crash!"), SPAN_WARNING("\The [src] breaks."))
 	playsound(src, shatter_sound, 70, 1)