diff --git a/main.py b/main.py
index e5891f2..dafd5ba 100644
--- a/main.py
+++ b/main.py
@@ -279,9 +279,9 @@ def main(driver: Chrome, logger = logging.getLogger('main')):
     sp.set('actions', lambda: flow.capabilities())
     
     def ready(name: str, b64: str):
+        nonlocal status, filename, wb, limit
         from base64 import b64decode
         from openpyxl import load_workbook
-        nonlocal status, filename, wb, limit
         if status != Status.IDLE: raise ValueError(status)
         
         data = b64decode(b64)
@@ -307,20 +307,20 @@ def main(driver: Chrome, logger = logging.getLogger('main')):
         from openpyxl import load_workbook
         if status != Status.CLOSING: raise ValueError(status)
         
+        col = headers.index(column.sent) + 1
         data = b64decode(b64)
-        index = headers.index(column.sent)
         buffer = BytesIO(data)
-        target = load_workbook(buffer)
+        source = load_workbook(buffer)
         
         for row in range(options.get('start'), limit + 1):
-            c1 = wb.active.cell(row, index + 1)
-            c2 = target.active.cell(row, index + 1)
+            c1 = source.active.cell(row, col)
+            c2 = wb.active.cell(row, col)
             if not (c1.value and str(c1.value).strip()):
                 if (c2.value and str(c2.value).strip()):
                     c1.value = c2.value
         
         io = BytesIO()
-        wb.save(io)
+        source.save(io)
         result = b64encode(io.getbuffer()).decode('ascii')
         return result