diff --git a/homeassistant/components/amcrest/__init__.py b/homeassistant/components/amcrest/__init__.py
index f915872abf0..d49104a0b26 100644
--- a/homeassistant/components/amcrest/__init__.py
+++ b/homeassistant/components/amcrest/__init__.py
@@ -167,6 +167,8 @@ class AmcrestChecker(Http):
                 offline = not self.available
             if offline and was_online:
                 _LOGGER.error("%s camera offline: Too many errors", self._wrap_name)
+                with self._token_lock:
+                    self._token = None
                 dispatcher_send(
                     self._hass, service_signal(SERVICE_UPDATE, self._wrap_name)
                 )