Random failure in WindowTest::testWindow

[uuf6429]

1494611636.538327 INFO       PHPUnit Start Test Behat\Mink\Tests\Driver\Js\WindowTest::testWindow
1494611636.550000 INFO         Page is unloading.
1494611636.553000 INFO         Unlinked window named null from id "1" for "http://localhost:8002/issue225.html".
1494611636.783000 INFO         Linked window named "electron_window_1" with id "1" for "http://localhost:8002/window.html".
1494611636.810000 INFO         Page finished loading.
1494611637.040000 INFO         Creating window "popup_1" for url "http://localhost:8002/popup1.html".
1494611637.040000 INFO         Page is unloading.
1494611637.061000 INFO         Browser window created with id 2.
1494611637.300000 INFO         Linked window named "popup_1" with id "2" for "http://localhost:8002/popup1.html".
1494611637.344000 INFO         Page finished loading.
1494611637.538000 INFO         Creating window "popup_2" for url "http://localhost:8002/popup2.html".
1494611637.538000 INFO         Page is unloading.
1494611637.556000 INFO         Browser window created with id 3.
1494611637.762000 ERRR         Uncaught exception: Error: Window named "popup_2" not found (possibly name cache not in sync).
                                   at findWindowByName (/home/travis/build/uuf6429/MinkElectronDriver/src/Server/Server.js:224:23)
                                   at switchToWindow (/home/travis/build/uuf6429/MinkElectronDriver/src/Server/Server.js:552:59)
                                   at Proto.apply (/home/travis/build/uuf6429/MinkElectronDriver/node_modules/dnode-protocol/index.js:123:13)
                                   at Proto.handle (/home/travis/build/uuf6429/MinkElectronDriver/node_modules/dnode-protocol/index.js:86:18)
                                   at dnode.handle (/home/travis/build/uuf6429/MinkElectronDriver/node_modules/dnode/lib/dnode.js:140:21)
                                   at dnode.write (/home/travis/build/uuf6429/MinkElectronDriver/node_modules/dnode/lib/dnode.js:106:22)
                                   at Socket.ondata (_stream_readable.js:555:20)
                                   at emitOne (events.js:96:13)
                                   at Socket.emit (events.js:188:7)
                                   at readableAddChunk (_stream_readable.js:176:18)
1494611637.766000 INFO         Window "popup_1" (id 2) has been closed.
1494611637.770000 INFO         Window "" (id 3) has been closed.
1494611637.778000 INFO         Window "electron_window_1" (id 1) has been closed.
1494611637.830043 ERRR         PHPUnit Test Error uuf6429\DnodeSyncClient\Exception\IOException: Can't read response from remote
                               
                               /home/travis/build/uuf6429/MinkElectronDriver/vendor/uuf6429/dnode-php-sync-client/src/uuf6429/DnodeSyncClient/Connection.php:104
                               /home/travis/build/uuf6429/MinkElectronDriver/src/ElectronDriver.php:827
                               /home/travis/build/uuf6429/MinkElectronDriver/src/ElectronDriver.php:244
                               /home/travis/build/uuf6429/MinkElectronDriver/vendor/behat/mink/src/Session.php:304
                               /home/travis/build/uuf6429/MinkElectronDriver/vendor/mink/driver-testsuite/tests/Js/WindowTest.php:29