diff --git a/packages/frontend/src/plugin.ts b/packages/frontend/src/plugin.ts
index 17eb99be2..a1a36480f 100644
--- a/packages/frontend/src/plugin.ts
+++ b/packages/frontend/src/plugin.ts
@@ -1,12 +1,12 @@
 import { Interpreter, Parser, utils, values } from '@syuilo/aiscript';
 import { createAiScriptEnv } from '@/scripts/aiscript/api';
 import { inputText } from '@/os';
-import { noteActions, notePostInterruptors, noteViewInterruptors, postFormActions, userActions } from '@/store';
+import { Plugin, noteActions, notePostInterruptors, noteViewInterruptors, postFormActions, userActions } from '@/store';
 
 const parser = new Parser();
 const pluginContexts = new Map<string, Interpreter>();
 
-export function install(plugin) {
+export function install(plugin: Plugin): void {
 	// 後方互換性のため
 	if (plugin.src == null) return;
 	console.info('Plugin installed:', plugin.name, 'v' + plugin.version);
@@ -15,7 +15,7 @@ export function install(plugin) {
 		plugin: plugin,
 		storageKey: 'plugins:' + plugin.id,
 	}), {
-		in: (q) => {
+		in: (q): Promise<string> => {
 			return new Promise(ok => {
 				inputText({
 					title: q,
@@ -28,10 +28,10 @@ export function install(plugin) {
 				});
 			});
 		},
-		out: (value) => {
+		out: (value): void => {
 			console.log(value);
 		},
-		log: (type, params) => {
+		log: (): void => {
 		},
 	});
 
@@ -40,9 +40,9 @@ export function install(plugin) {
 	aiscript.exec(parser.parse(plugin.src));
 }
 
-function createPluginEnv(opts) {
-	const config = new Map();
-	for (const [k, v] of Object.entries(opts.plugin.config || {})) {
+function createPluginEnv(opts: { plugin: Plugin; storageKey: string }): Record<string, values.Value> {
+	const config = new Map<string, values.Value>();
+	for (const [k, v] of Object.entries(opts.plugin.config ?? {})) {
 		config.set(k, utils.jsToVal(typeof opts.plugin.configData[k] !== 'undefined' ? opts.plugin.configData[k] : v.default));
 	}
 
@@ -50,22 +50,28 @@ function createPluginEnv(opts) {
 		...createAiScriptEnv({ ...opts, token: opts.plugin.token }),
 		//#region Deprecated
 		'Mk:register_post_form_action': values.FN_NATIVE(([title, handler]) => {
+			utils.assertString(title);
 			registerPostFormAction({ pluginId: opts.plugin.id, title: title.value, handler });
 		}),
 		'Mk:register_user_action': values.FN_NATIVE(([title, handler]) => {
+			utils.assertString(title);
 			registerUserAction({ pluginId: opts.plugin.id, title: title.value, handler });
 		}),
 		'Mk:register_note_action': values.FN_NATIVE(([title, handler]) => {
+			utils.assertString(title);
 			registerNoteAction({ pluginId: opts.plugin.id, title: title.value, handler });
 		}),
 		//#endregion
 		'Plugin:register_post_form_action': values.FN_NATIVE(([title, handler]) => {
+			utils.assertString(title);
 			registerPostFormAction({ pluginId: opts.plugin.id, title: title.value, handler });
 		}),
 		'Plugin:register_user_action': values.FN_NATIVE(([title, handler]) => {
+			utils.assertString(title);
 			registerUserAction({ pluginId: opts.plugin.id, title: title.value, handler });
 		}),
 		'Plugin:register_note_action': values.FN_NATIVE(([title, handler]) => {
+			utils.assertString(title);
 			registerNoteAction({ pluginId: opts.plugin.id, title: title.value, handler });
 		}),
 		'Plugin:register_note_view_interruptor': values.FN_NATIVE(([handler]) => {
@@ -75,54 +81,78 @@ function createPluginEnv(opts) {
 			registerNotePostInterruptor({ pluginId: opts.plugin.id, handler });
 		}),
 		'Plugin:open_url': values.FN_NATIVE(([url]) => {
+			utils.assertString(url);
 			window.open(url.value, '_blank');
 		}),
 		'Plugin:config': values.OBJ(config),
 	};
 }
 
-function initPlugin({ plugin, aiscript }) {
+function initPlugin({ plugin, aiscript }): void {
 	pluginContexts.set(plugin.id, aiscript);
 }
 
-function registerPostFormAction({ pluginId, title, handler }) {
+function registerPostFormAction({ pluginId, title, handler }): void {
 	postFormActions.push({
 		title, handler: (form, update) => {
-			pluginContexts.get(pluginId).execFn(handler, [utils.jsToVal(form), values.FN_NATIVE(([key, value]) => {
-				update(key.value, value.value);
+			const pluginContext = pluginContexts.get(pluginId);
+			if (!pluginContext) {
+				return;
+			}
+			pluginContext.execFn(handler, [utils.jsToVal(form), values.FN_NATIVE(([key, value]) => {
+				if (!key || !value) {
+					return;
+				}
+				update(utils.valToJs(key), utils.valToJs(value));
 			})]);
 		},
 	});
 }
 
-function registerUserAction({ pluginId, title, handler }) {
+function registerUserAction({ pluginId, title, handler }): void {
 	userActions.push({
 		title, handler: (user) => {
-			pluginContexts.get(pluginId).execFn(handler, [utils.jsToVal(user)]);
+			const pluginContext = pluginContexts.get(pluginId);
+			if (!pluginContext) {
+				return;
+			}
+			pluginContext.execFn(handler, [utils.jsToVal(user)]);
 		},
 	});
 }
 
-function registerNoteAction({ pluginId, title, handler }) {
+function registerNoteAction({ pluginId, title, handler }): void {
 	noteActions.push({
 		title, handler: (note) => {
-			pluginContexts.get(pluginId).execFn(handler, [utils.jsToVal(note)]);
+			const pluginContext = pluginContexts.get(pluginId);
+			if (!pluginContext) {
+				return;
+			}
+			pluginContext.execFn(handler, [utils.jsToVal(note)]);
 		},
 	});
 }
 
-function registerNoteViewInterruptor({ pluginId, handler }) {
+function registerNoteViewInterruptor({ pluginId, handler }): void {
 	noteViewInterruptors.push({
 		handler: async (note) => {
-			return utils.valToJs(await pluginContexts.get(pluginId).execFn(handler, [utils.jsToVal(note)]));
+			const pluginContext = pluginContexts.get(pluginId);
+			if (!pluginContext) {
+				return;
+			}
+			return utils.valToJs(await pluginContext.execFn(handler, [utils.jsToVal(note)]));
 		},
 	});
 }
 
-function registerNotePostInterruptor({ pluginId, handler }) {
+function registerNotePostInterruptor({ pluginId, handler }): void {
 	notePostInterruptors.push({
 		handler: async (note) => {
-			return utils.valToJs(await pluginContexts.get(pluginId).execFn(handler, [utils.jsToVal(note)]));
+			const pluginContext = pluginContexts.get(pluginId);
+			if (!pluginContext) {
+				return;
+			}
+			return utils.valToJs(await pluginContext.execFn(handler, [utils.jsToVal(note)]));
 		},
 	});
 }
diff --git a/packages/frontend/src/store.ts b/packages/frontend/src/store.ts
index fd2f2523c..14226468e 100644
--- a/packages/frontend/src/store.ts
+++ b/packages/frontend/src/store.ts
@@ -287,12 +287,15 @@ export const defaultStore = markRaw(new Storage('base', {
 
 const PREFIX = 'miux:' as const;
 
-type Plugin = {
+export type Plugin = {
 	id: string;
 	name: string;
 	active: boolean;
+	config?: Record<string, { default: any }>;
 	configData: Record<string, any>;
 	token: string;
+	src: string | null;
+	version: string;
 	ast: any[];
 };