diff --git a/odoo/tests/common.py b/odoo/tests/common.py
index c72832b4ad0..c68aaf0e515 100644
--- a/odoo/tests/common.py
+++ b/odoo/tests/common.py
@@ -644,6 +644,7 @@ class ChromeBrowser():
         os.makedirs(self.screenshots_dir, exist_ok=True)
 
         self.window_size = window_size
+        self.sigxcpu_handler = None
         self._chrome_start()
         self._find_websocket()
         self._logger.info('Websocket url found: %s', self.ws_url)
@@ -652,7 +653,6 @@ class ChromeBrowser():
         self._websocket_send('Runtime.enable')
         self._logger.info('Chrome headless enable page notifications')
         self._websocket_send('Page.enable')
-        self.sigxcpu_handler = None
         if os.name == 'posix':
             self.sigxcpu_handler = signal.getsignal(signal.SIGXCPU)
             signal.signal(signal.SIGXCPU, self.signal_handler)
@@ -811,6 +811,8 @@ class ChromeBrowser():
         """
         send chrome devtools protocol commands through websocket
         """
+        if self.ws is None:
+            return
         sent_id = self.request_id
         payload = {
             'method': method,