I have a Project with 2 milestones, 1 archived, the other new. I have assigned some tasks to it already via the parents work board. When I go to the Milestone project directly, the Work Board icon is grayed out, as I've not created one for it yet. When clicking on it, instead of giving me the option to create or import like Phabricator use to, it now shows an error:
```
Unhandled Exception ("RuntimeException")
Undefined variable: default_
phid
```
This is the full exception data from the log.
```
EXCEPTION: (RuntimeException) Undefined variable: default_phid at [<phutil>/src/error/PhutilErrorHandler.php:210]
arcanist(head=master, ref.master=57f6fb59d739), phabricator(head=master, ref.master=aa6c99384879), phutil(head=master, ref.master=f43291e99d36)
#0 <#2> PhutilErrorHandler::handleError(integer, string, string, integer, array) called at [<phabricator>/src/applications/project/engine/PhabricatorBoardLayoutEngine.php:572]
#1 <#2> PhabricatorBoardLayoutEngine::layoutBoard(PhabricatorProject, array, array) called at [<phabricator>/src/applications/project/engine/PhabricatorBoardLayoutEngine.php:78]
#2 <#2> PhabricatorBoardLayoutEngine::executeLayout() called at [<phabricator>/src/applications/project/controller/PhabricatorProjectBoardViewController.php:125]
#3 <#2> PhabricatorProjectBoardViewController::handleRequest(AphrontRequest) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:237]
#4 phlog(RuntimeException) called at [<phabricator>/src/aphront/handler/PhabricatorDefaultRequestExceptionHandler.php:32]
#5 PhabricatorDefaultRequestExceptionHandler::handleRequestException(AphrontRequest, RuntimeException) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:632]
#6 AphrontApplicationConfiguration::handleException(RuntimeException) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:242]
#7 AphrontApplicationConfiguration::processRequest(AphrontRequest, PhutilDeferredLog, AphrontPHPHTTPSink, MultimeterControl) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:149]
#8 AphrontApplicationConfiguration::runHTTPRequest(AphrontPHPHTTPSink) called at [<phabricator>/webroot/index.php:17]
```