diff --git a/index.html b/index.html
index 365247a..72d578b 100644
--- a/index.html
+++ b/index.html
@@ -241,7 +241,7 @@ async function handlePrimaryButtonClick() {
             break;
         case 'READY':
             let locale = $('#locale').value;
-            let options = { locale, mapping: new Object(), writable: new Boolean(writable) };
+            let options = { locale, subcategories, mapping: new Object(), writable: new Boolean(writable), start: 2, limit: null };
 
             for (let element of $.all("input[type='number'].params")) {
                 parameters[element.id] = element.disabled ? null : element.valueAsNumber;
@@ -264,9 +264,8 @@ async function handlePrimaryButtonClick() {
             }
 
             if (options.slice) {
-                options.start = $('#offset').valueAsNumber * $('#chunksize').valueAsNumber + 2;
                 options.limit = Math.min(minor || major, $('#chunksize').valueAsNumber);
-                options.subcategories = subcategories.length > 0 ? subcategories: null;
+                options.start += $('#offset').valueAsNumber * $('#chunksize').valueAsNumber;
             }
 
             await Rpc2.invoke('begin', options, parameters);
@@ -432,8 +431,8 @@ while (await new Promise(o => setTimeout(o, 1000, true))) {
             $('#remainingLabel').innerText = '';
             break;
         case 'CLOSING':
-            try {
-                if (writable === null) break;
+            if (writable) try {
+                $.all('#actions > button').forEach(e => e.disabled = true);
                 let data = await filereader().then(([_, b]) => Rpc2.invoke('merge', new Uint8Array(b).toBase64()));
                 await writable.write(Uint8Array.fromBase64(data));
                 await writable.close();
@@ -443,6 +442,7 @@ while (await new Promise(o => setTimeout(o, 1000, true))) {
                 await writable.abort().catch(() => void 0);
             }
             writable = null;
+            continue;
         case 'RUNNING':
             $('#send > span.text').innerText = 'Pause';
             $('#send').classList.add('pulse');
diff --git a/main.py b/main.py
index d60048f..7c022be 100644
--- a/main.py
+++ b/main.py
@@ -93,7 +93,7 @@ def main(driver: Chrome, logger = logging.getLogger('main')):
         result = dict()
         col = headers.index(header) + 1
 
-        for row in range(options.get('start', 2), limit + 1):
+        for row in range(options.get('start'), limit + 1):
             key = str(wb.active.cell(row, col).value)
             result[key] = result.get(key, 0) + 1
 
@@ -318,7 +318,7 @@ def main(driver: Chrome, logger = logging.getLogger('main')):
         buffer = BytesIO(data)
         target = load_workbook(buffer)
         
-        for row in range(options.get('start', 2), limit + 1):
+        for row in range(options.get('start'), limit + 1):
             c1 = wb.active.cell(row, index + 1)
             c2 = target.active.cell(row, index + 1)
             if not (c1.value and str(c1.value).strip()):