diff --git a/src/webpage/channel.ts b/src/webpage/channel.ts
index 46cfb7e..e3dfb8d 100644
--- a/src/webpage/channel.ts
+++ b/src/webpage/channel.ts
@@ -47,7 +47,7 @@ class Channel extends SnowFlake {
 	parentId?: string;
 	parent?: Channel;
 	children!: Channel[];
-	readonly permissionOverwriteMap!: Map<string, Permissions>;
+	readonly permissionOverwriteMap = new Map<string, Permissions>();
 	permissionOverwriteOrder: string[] = [];
 	topic!: string;
 	nsfw!: boolean;
@@ -90,9 +90,9 @@ class Channel extends SnowFlake {
 	static contextmenu = new Contextmenu<Channel, undefined>("channel menu");
 	replyingto!: Message | null;
 	infinite!: InfiniteScroller;
-	idToPrev: Map<string, string | undefined>;
-	idToNext: Map<string, string | undefined>;
-	messages: Map<string, Message>;
+	readonly idToPrev: Map<string, string | undefined>;
+	readonly idToNext: Map<string, string | undefined>;
+	readonly messages: Map<string, Message>;
 	voice?: Voice;
 	bitrate: number = 128000;
 	threadData?: threadMetadata;
diff --git a/src/webpage/localuser.ts b/src/webpage/localuser.ts
index 4d4338d..0071a76 100644
--- a/src/webpage/localuser.ts
+++ b/src/webpage/localuser.ts
@@ -69,7 +69,7 @@ interface MDSearchOption {
 
 MarkDown.emoji = Emoji;
 class Localuser {
-	badges = new Map<
+	readonly badges = new Map<
 		string,
 		{id: string; description: string; icon: string; link?: string; translate?: boolean}
 	>(badgeArr);
@@ -90,9 +90,9 @@ class Localuser {
 	readonly guilds = new Map<string, Guild>();
 	readonly channels: Map<string, Channel> = new Map();
 	readonly userMap: Map<string, User> = new Map();
-	messages = new Map<string, Message>();
-	idToPrev = new Map<string, string | undefined>();
-	idToNext = new Map<string, string | undefined>();
+	readonly messages = new Map<string, Message>();
+	readonly idToPrev = new Map<string, string | undefined>();
+	readonly idToNext = new Map<string, string | undefined>();
 	get status() {
 		return this.user.status;
 	}