diff --git a/Makefile b/Makefile
index 4bf1ac7..ddccd8c 100644
--- a/Makefile
+++ b/Makefile
@@ -52,7 +52,7 @@ endif
 DEBUG ?= off
 ifeq ($(DEBUG), on)
 	SOURCEMAP := --sourcemap
-	TYPECHECK := tsc -noEmit --project ts/tsconfig.json
+	TYPECHECK := npx tsc -noEmit --project ts/tsconfig.json
 	# jank
 	COPYTS := rm -r $(DATA)/web/js/ts; cp -r tempts $(DATA)/web/js/ts
 	UNCSS := cp $(DATA)/web/css/bundle.css $(DATA)/bundle.css
diff --git a/lang/setup/en-us.json b/lang/setup/en-us.json
index 92f7233..79780c0 100644
--- a/lang/setup/en-us.json
+++ b/lang/setup/en-us.json
@@ -16,11 +16,13 @@
         "emailSubject": "Email Subject",
         "URL": "URL",
         "apiKey": "API Key",
+        "error": "Error",
         "errorInvalidUserPass": "Invalid username/password.",
         "errorNotAdmin": "User is not allowed to manage server.",
         "errorUserDisabled": "User may be disabled.",
         "error404": "404, check the internal URL.",
-        "errorConnectionRefused": "Connection refused."
+        "errorConnectionRefused": "Connection refused.",
+        "errorUnknown": "Unknown error, check app logs."
     },
     "startPage": {
         "welcome": "Welcome!",
diff --git a/ts/modules/common.ts b/ts/modules/common.ts
index 6b0ea74..4687cc8 100644
--- a/ts/modules/common.ts
+++ b/ts/modules/common.ts
@@ -5,7 +5,7 @@ export function toDateString(date: Date): string {
     const t12 = document.getElementById("lang-12h") as HTMLInputElement;
     const t24 = document.getElementById("lang-24h") as HTMLInputElement;
     let args1 = {};
-    let args2 = {
+    let args2: Intl.DateTimeFormatOptions = {
         hour: "2-digit",
         minute: "2-digit"
     };
diff --git a/ts/setup.ts b/ts/setup.ts
index 2a1a190..daf2bbf 100644
--- a/ts/setup.ts
+++ b/ts/setup.ts
@@ -1,4 +1,4 @@
-import { _get, _post, toggleLoader } from "./modules/common.js";
+import { _get, _post, toggleLoader, notificationBox } from "./modules/common.js";
 import { lang, LangFile, loadLangSelector } from "./modules/lang.js";
 
 interface sWindow extends Window {
@@ -8,6 +8,10 @@ interface sWindow extends Window {
 declare var window: sWindow;
 window.URLBase = "";
 
+
+window.notifications = new notificationBox(document.getElementById('notification-box') as HTMLDivElement, 5);
+
+
 const get = (id: string): HTMLElement => document.getElementById(id);
 const text = (id: string, val: string) => { document.getElementById(id).textContent = val; };
 const html = (id: string, val: string) => { document.getElementById(id).innerHTML = val; };
@@ -341,6 +345,18 @@ const serialize = () => {
         if (req.readyState == 4) {
             toggleLoader(restartButton);
             if (req.status == 500) {
+                if (req.response == null) {
+                    const old = restartButton.textContent;
+                    restartButton.classList.add("~critical");
+                    restartButton.classList.remove("~urge");
+                    restartButton.textContent = window.lang.strings("errorUnknown");
+                    setTimeout(() => {
+                        restartButton.classList.add("~urge");
+                        restartButton.classList.remove("~critical");
+                        restartButton.textContent = old;
+                    }, 5000);
+                    return;
+                }
                 if (req.response["error"] as string) {
                     const old = restartButton.textContent;
                     restartButton.classList.add("~critical");
@@ -363,7 +379,11 @@ const serialize = () => {
                 window.location.href = host;
             };
         }
-    }, true, () => {});
+    }, true, (req: XMLHttpRequest) => {
+        if (req.status == 0) {
+            window.notifications.customError("connectionError", window.lang.strings("errorConnectionRefused"));
+        }
+    });
 }
 restartButton.onclick = serialize;
 
@@ -562,7 +582,11 @@ window.onpopstate = (event: PopStateEvent) => {
                     button.classList.remove("~positive");
                 }, 5000);
             }
-        }, true, () => {});
+        }, true, (req: XMLHttpRequest) => {
+            if (req.status == 0) {
+                window.notifications.customError("connectionError", window.lang.strings("errorConnectionRefused"));
+            }
+        });
     };
 })();