diff --git a/main.py b/main.py
index c6fe317..c5b4d61 100644
--- a/main.py
+++ b/main.py
@@ -10,7 +10,7 @@ import re
 import trio
 import trio_websocket as ws
 
-from selenium.common.exceptions import StaleElementReferenceException, TimeoutException
+from selenium.common.exceptions import StaleElementReferenceException, TimeoutException, InvalidSessionIdException
 from selenium.webdriver import Chrome, ChromeOptions
 from selenium.webdriver.common.action_chains import ActionChains
 from selenium.webdriver.common.by import By
@@ -332,8 +332,6 @@ def main(driver: WebDriver):
 
         cursor = 0
         status = Status.ACTIVE
-        occurrences = {}
-        request = None
         sent = 0
         errors = 0
         warnings = 0
@@ -343,28 +341,27 @@ def main(driver: WebDriver):
             current = cursor
             cursor += 1
 
-            recipient = str(recipients[current]).strip()
             name = names[current]
             code = codes[current]
             axis = index[current]
 
-            occurrence = occurrences.setdefault(code, [0]) if code else [0]
-            try: outbox.put(Command('setProgress', cursor, name, recipient, sent, warnings, errors))
-            except ShutDown: break
+            occurrence = pandas.Series.count(frame[frame[cc] == code][cs]) if code is not None else 0
+            recipient = str(recipients[current]).strip()
 
             if (remarks := frame.loc[axis, cs]) is not None and str(remarks).strip():
                 tell(f'已跳过项目 {recipient}')
-                occurrence[0] += 1
                 continue
 
-            if (maximum := parameters.get('max_occurrence')) and occurrence[0] >= maximum:
-                tell(f'收件人 {recipient} 所属组织出现次数已超出限制 {occurrence}', level=1)
+            if (maximum := parameters.get('max_occurrence')) and occurrence >= maximum:
+                tell(f'已跳过项目 {recipient}')
                 warnings += 1
                 continue
 
             while status.isactive():
                 try:
+                    outbox.put(Command('setProgress', cursor, name, recipient, sent, warnings, errors, attempt))
                     tell('正在发送：%s (%.2f %%)' % (recipient, current / limit * 100))
+
                     clean = True
                     attempt += 1
                     request = get_request()
@@ -457,7 +454,6 @@ def main(driver: WebDriver):
                             click("div.io-ox-alert.io-ox-alert-error button[data-action='close']")
                         except TimeoutException:
                             frame.loc[axis, cs] = '✔️'
-                            occurrence[0] += 1
                             sent += 1
                             break
 
@@ -475,25 +471,37 @@ def main(driver: WebDriver):
                         tell('已超出最大重试上限', level=1)
                         errors += 1
                         break
+                except (KeyboardInterrupt, InvalidSessionIdException, ShutDown):
+                    request = None
+                    exception = None
                 except Faillable as o:
                     request = o.request
+                    exception = None
                 except Exception as e:
-                    tell(f'发生错误 ({attempt})', e, level=0)
-                    if connection.closed or isinstance(e, KeyboardInterrupt):
-                        status = Status.TERMINATED
-                        break
-                    outbox.put(Command('setStatus', 'FAILED'))
-                    request = inbox.get()
+                    request = None
+                    exception = e
 
+                if exception is not None:
+                    try:
+                        tell(f'发生错误 ({attempt})', exception, level=0)
+                        outbox.put(Command('setStatus', 'FAILED'))
+                        request = inbox.get()
+                    except ShutDown:
+                        pass
+
+                if request == 'CANCEL':
+                    outbox.put(Command('setStatus', 'CANCEL'))
+                    status = Status.INACTIVE
+                    break
                 if request == 'BYPASS':
                     outbox.put(Command('setStatus', 'BYPASS'))
                     break
                 if request == 'RESUME':
                     outbox.put(Command('setStatus', 'RESUME'))
                     continue
-                if request == 'CANCEL':
-                    outbox.put(Command('setStatus', 'CANCEL'))
-                    status = Status.INACTIVE
+
+                tell('程序中断', level=1)
+                status = Status.TERMINATED
 
         progress = cursor / limit * 100
         tell('当前进度：%.2f %%' % progress)
@@ -512,7 +520,7 @@ def main(driver: WebDriver):
                         break
                 except Exception as e:
                     tell(f'写入文件时发生错误 ({attempt})', e, level=1)
-                    time.sleep(1)
+                    time.sleep(parameters.get('interval'))
                     continue
 
         if status.isalive(): outbox.put(Command('setStatus', 'FINISH'))