diff --git a/wxbox-web/src/lib/map/layer.ts b/wxbox-web/src/lib/map/layer.ts
index 6c294d8..b3486ab 100644
--- a/wxbox-web/src/lib/map/layer.ts
+++ b/wxbox-web/src/lib/map/layer.ts
@@ -1,10 +1,10 @@
 import { env } from '$env/dynamic/public';
 
 export interface MutexLayerSet<ValidOpts> {
-	map1: ValidOpts | null;
-	map2: ValidOpts | null;
-	map3: ValidOpts | null;
-	map4: ValidOpts | null;
+	map1: ValidOpts;
+	map2: ValidOpts;
+	map3: ValidOpts;
+	map4: ValidOpts;
 }
 export interface OverlayLayerSet<ValidOpts> {
 	map1: ValidOpts[];
diff --git a/wxbox-web/src/routes/+page.svelte b/wxbox-web/src/routes/+page.svelte
index ad9782b..4c8120b 100644
--- a/wxbox-web/src/routes/+page.svelte
+++ b/wxbox-web/src/routes/+page.svelte
@@ -32,7 +32,7 @@
 		map3: null,
 		map4: null
 	});
-	let overlayLayers: OverlayLayerSet<string[]> = $state({
+	let overlayLayers: OverlayLayerSet<string> = $state({
 		map1: [],
 		map2: [],
 		map3: [],