diff --git a/index.html b/index.html
index 90bcf93..345b5e8 100644
--- a/index.html
+++ b/index.html
@@ -129,27 +129,21 @@
 </form>
 
 <script type="text/javascript">
-const $ = (selectors, fn) => {
-    let e = document.querySelector(selectors);
-    return fn && e ? fn(e) : e;
+const $ = (selectors) => {
+    return document.querySelector(selectors);
 };
 
-const $$ = (selectors, fn) => {
-    let e = document.querySelectorAll(selectors);
-    return fn && e ? fn(e) : e;
+const $$ = (selectors) => {
+    return document.querySelectorAll(selectors);
 };
 
 const $$$ = (selectors, event, listener) => {
     $(selectors).addEventListener(event, listener);
 };
 
-let Profiles = new Array();
-let Latest = null;
-let Status = null;
-
-function main(profiles, args) {
+function main(profiles, args, status=null, error=null) {
     $$$('#begin', 'click', async () => {
-        switch (Status) {
+        switch (status) {
             case 'READY':
                 let name = $('#name').value;
                 let options = { profile: name };
@@ -177,19 +171,19 @@ function main(profiles, args) {
         }
     });
 
-    $$$('#begin', 'click', (e) => {
+    $$$('#begin', 'click', () => {
         $('#begin > span.icon').removeAttribute('hidden');
         $('#begin > span.text').innerText = '';
         $('#begin').classList.remove('pulse');
         $('#begin').disabled = true;
     });
 
-    $$$('#cancel', 'click', async (e) => {
+    $$$('#cancel', 'click', async () => {
         $('#cancel').disabled = true;
         await Rpc2.invoke('cancel');
     });
 
-    $$$('#skip', 'click', async (e) => {
+    $$$('#skip', 'click', async () => {
         $('#skip').disabled = true;
         await Rpcs.invoke('skip');
     });
@@ -200,16 +194,15 @@ function main(profiles, args) {
     });
 
     $$$('#name', 'change', (e) => {
-        let p = Profiles.find(o => o.name === e.target.value);
-        for (let k of Object.keys(p)) $(`#${k}`, e => e.value = p[k] ?? '');
+        let p = profiles.find(o => o.name === e.target.value);
+        for (let k of Object.keys(p)) $(`#${k}`)?.setAttribute('value', p[k] ?? '');
     });
 
     $$$('#all', 'change', (e) => {
         $('#name').disabled = e.target.checked;
     });
 
-    for (let item of JSON.parse(profiles)) {
-        Profiles.push(item);
+    for (let item of profiles) {
         $('#name').add(new Option(item.name, item.name));
         $('#name').dispatchEvent(new Event('change'));
     }
@@ -236,17 +229,17 @@ function main(profiles, args) {
         let logs = Array.from(history);
 
         for (let record of logs) {
-            if (record.levelno >= 40) Latest = record;
+            if (record.levelno >= 40) error = record;
             let message = LogRecord.format(record);
             let node = document.createTextNode(new String(message).concat('\n'));
             $('#messages').appendChild(node);
             $('#messages').scrollTop = $('#messages').scrollHeight;
         }
 
-        Status = await Rpc2.invoke('status');
-        $('#statusLabel').innerText = Status.charAt(0).toUpperCase() + Status.slice(1).toLowerCase();
+        status = await Rpc2.invoke('status');
+        $('#statusLabel').innerText = status.charAt(0).toUpperCase() + status.slice(1).toLowerCase();
 
-        switch (Status) {
+        switch (status) {
             case 'IDLE':
                 return;
             case 'READY':
@@ -267,16 +260,13 @@ function main(profiles, args) {
                 let [t1, t2] = await Rpc2.invoke('uptime').catch(() => []);
                 $('#uptimeLabel').innerText = Temporal.Duration.from({ seconds: t1 ?? 0 }).round({ largestUnit: 'hours' }).toLocaleString('en', { style: 'digital' });
 
-                if (index && limit && t2) {
-                    let rate = index / t2;
-                    let remaining = Math.floor((limit - index) / rate);
-                    $('#remainingLabel').innerHTML = Temporal.Duration.from({ seconds: remaining }).round({ largestUnit: 'hours' }).toLocaleString('en');
-                }
+                let remaining = index && limit && t2 ? Math.floor((limit - index) / (index / t2)) : 0;
+                $('#remainingLabel').innerHTML = remaining ? Temporal.Duration.from({ seconds: remaining }).round({ largestUnit: 'hours' }).toLocaleString('en') : '';
                 break;
             case 'STANDBY':
-                if (Latest !== null) {
-                    alert(`(${Latest.levelname}) ${Latest.msg}\n${Latest.exc_text ?? ''}`);
-                    Latest = null;
+                if (error !== null) {
+                    alert(`(${error.levelname}) ${error.msg}\n${error.exc_text ?? ''}`);
+                    error = null;
                 }
                 $('#begin > span.text').innerText = 'Resume';
                 $('#begin').classList.remove('pulse');
diff --git a/main.py b/main.py
index 0f05855..e552c2b 100644
--- a/main.py
+++ b/main.py
@@ -63,11 +63,10 @@ def main(driver: WebDriver, logger = logging.getLogger('main')):
     t1 = Timer()
     t2 = Timer()
     options = dict()
-    profiles: list[Profile] = list()
     status = Status.IDLE
 
     def begin(opts: dict, args: dict):
-        nonlocal options, status
+        nonlocal status
         options.update(opts)
         status = Status.RUNNING
         parameters.update(args)
@@ -94,20 +93,17 @@ def main(driver: WebDriver, logger = logging.getLogger('main')):
     jsonrpc2.define('uptime', lambda: [t1.delta()])
 
     try:
-        for source, profile in zip(parameters.get('profile'), repeat(dict())):
-            for key, value in map(lambda o: str.split(o, '=', 2), source):
-                profile[key.lower().strip()] = value.strip()
-            
-            item = Profile(**profile)
-            profiles.append(item)
+        profiles = [
+            Profile(**{ k.lower().strip(): v.strip() for k, v in map(lambda o: str.split(o, '=', 2), p) })
+            for p in parameters.get('profile')
+        ]
     except Exception as e:
         logger.critical('Unable to load profiles', exc_info=e)
         return 2
 
     try:
-        manifest = json.dumps(profiles, default=vars)
         driver.get(str(Path('index.html').resolve()))
-        driver.execute_script(jsonrpc2.prelude(), manifest, parameters)
+        driver.execute_script(jsonrpc2.prelude(), list(map(vars, profiles)), parameters)
     except Exception as e:
         logger.critical('Unable to load starup page', exc_info=e)
         return 3
@@ -234,7 +230,7 @@ def main(driver: WebDriver, logger = logging.getLogger('main')):
         @classmethod
         def perform(cls):
             nonlocal status
-            statis = Status.READY
+            status = Status.READY
             driver.switch_to.window(driver.window_handles[0])
             raise cls
 
@@ -380,13 +376,29 @@ def main(driver: WebDriver, logger = logging.getLogger('main')):
                 progress['number'] = number
                 progress['index'] = i-1
 
-                if (id := item['category_id']) not in categories:
+                if (x := item['category_id']) not in categories:
                     flow.react()
-                    categories[id] = fetch(f'{base}/categories/{id}.json?api_token={profile.token}')
+                    response = fetch(f'{base}/categories/{x}.json?api_token={profile.token}')
 
-                if (id := item['client_id']) not in clients:
+                    if 'error' in response:
+                        error = response['error']
+                        code = response['code']
+                        logger.warning("Error while fetching 'category' (code: %s, message: %s); skipping", code, error)
+                        continue
+                    else:
+                        categories[x] = response
+
+                if (x := item['client_id']) not in clients:
                     flow.react()
-                    clients[id] = fetch(f'{base}/clients/{id}.json?api_token={profile.token}')
+                    response = fetch(f'{base}/clients/{x}.json?api_token={profile.token}')
+
+                    if 'error' in response:
+                        error = response['error']
+                        code = response['code']
+                        logger.warning("Error while fetching 'client' (code: %s, message: %s); skipping", code, error)
+                        continue
+                    else:
+                        clients[x] = response
 
                 category = categories.get(item['category_id'])
                 client = clients.get(item['client_id'])
@@ -535,6 +547,7 @@ def main(driver: WebDriver, logger = logging.getLogger('main')):
 
         while index < len(data):
             try:
+                attempts += 1
                 driver.switch_to.window(driver.window_handles[2])
                 item = data[index]
                 kind = item['kind']
@@ -542,7 +555,6 @@ def main(driver: WebDriver, logger = logging.getLogger('main')):
                 number = profile.format(item['number'])
                 positions = item['positions']
                 opportunity = None
-                attempts += 1
 
                 if kind != 'vat':
                     logger.info('[%d/%d] Skipping %s', index+1, len(data), number)