diff --git a/DrissionPage/__init__.py b/DrissionPage/__init__.py
index 65d5714..a7fc44d 100644
--- a/DrissionPage/__init__.py
+++ b/DrissionPage/__init__.py
@@ -12,4 +12,4 @@ from ._pages.chromium_page import ChromiumPage
 from ._pages.session_page import SessionPage
 from ._pages.web_page import WebPage
 
-__version__ = '4.1.0.7'
+__version__ = '4.1.0.8'
diff --git a/DrissionPage/_base/chromium.py b/DrissionPage/_base/chromium.py
index 20bb17d..096a88e 100644
--- a/DrissionPage/_base/chromium.py
+++ b/DrissionPage/_base/chromium.py
@@ -396,15 +396,16 @@ class Chromium(object):
                 pass
 
     def _onTargetDestroyed(self, **kwargs):
-        tab_id = kwargs['targetId']
-        self._dl_mgr.clear_tab_info(tab_id)
-        for key in [k for k, i in self._frames.items() if i == tab_id]:
-            self._frames.pop(key, None)
-        for d in self._all_drivers.get(tab_id, tuple()):
-            d.stop()
-        self._drivers.pop(tab_id, None)
-        self._all_drivers.pop(tab_id, None)
-        self._tab_to_close.discard(tab_id)
+        with self._lock:
+            tab_id = kwargs['targetId']
+            self._dl_mgr.clear_tab_info(tab_id)
+            for key in [k for k, i in self._frames.items() if i == tab_id]:
+                self._frames.pop(key, None)
+            for d in self._all_drivers.get(tab_id, tuple()):
+                d.stop()
+            self._drivers.pop(tab_id, None)
+            self._all_drivers.pop(tab_id, None)
+            self._tab_to_close.discard(tab_id)
 
     def _on_disconnect(self):
         if not self._disconnect_flag:
diff --git a/DrissionPage/_functions/web.py b/DrissionPage/_functions/web.py
index d6061b7..f1a1f3d 100644
--- a/DrissionPage/_functions/web.py
+++ b/DrissionPage/_functions/web.py
@@ -302,10 +302,10 @@ def tree(ele_or_page, text=False, show_js=False, show_css=False):
 def format_headers(txt):
     if isinstance(txt, (dict, CaseInsensitiveDict)):
         for k, v in txt.items():
-            if k in (':method', ':scheme', ':authority', ':path'):
-                txt.pop(k)
-            elif v not in (None, False, True):
+            if v not in (None, False, True):
                 txt[k] = str(v)
+        for i in (':method', ':scheme', ':authority', ':path'):
+            txt.pop(i, None)
         return txt
     headers = {}
     for header in txt.split('\n'):