Suppress UnknownErrorException in _closeSession

Author: eXorus

src/Codeception/Module/WebDriver.php

@@ -32,6 +32,7 @@
 use Facebook\WebDriver\Exception\InvalidElementStateException;
 use Facebook\WebDriver\Exception\InvalidSelectorException;
 use Facebook\WebDriver\Exception\NoSuchElementException;
+use Facebook\WebDriver\Exception\UnknownErrorException;
 use Facebook\WebDriver\Exception\UnknownServerException;
 use Facebook\WebDriver\Exception\WebDriverCurlException;
 use Facebook\WebDriver\Interactions\WebDriverActions;
@@ -1533,6 +1534,8 @@ public function _closeSession($webDriver = null)
             unset($webDriver);
         } catch (UnknownServerException $e) {
             // Session already closed so nothing to do
+        } catch (UnknownErrorException $e) {
+            // Session already closed so nothing to do
         }
     }