Looking at downstream logs, running an old Phorge/Phabricator version but reading upstream code this can still happen:
```
[2023-08-21 04:15:00] EXCEPTION: (RuntimeException) min(): Array must contain at least one element at [<arcanist>/src/error/PhutilErrorHandler.php:261]
arcanist(), ava(), phabricator(), translations(), wmf-ext-misc()
#0 <#2> PhutilErrorHandler::handleError(integer, string, string, integer, array) called at [<arcanist>/src/error/PhutilErrorHandler.php:261]
#1 <#2> min(array) called at [<phabricator>/src/applications/diffusion/controller/DiffusionBlameController.php:201]
#2 <#2> DiffusionBlameController::handleRequest(AphrontRequest) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:284]
#3 phlog(RuntimeException) called at [<phabricator>/src/aphront/handler/PhabricatorAjaxRequestExceptionHandler.php:27]
#4 PhabricatorAjaxRequestExceptionHandler::handleRequestThrowable(AphrontRequest, RuntimeException) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:751]
#5 AphrontApplicationConfiguration::handleThrowable(RuntimeException) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:296]
#6 AphrontApplicationConfiguration::processRequest(AphrontRequest, PhutilDeferredLog, AphrontPHPHTTPSink, MultimeterControl) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:204]
#7 AphrontApplicationConfiguration::runHTTPRequest(AphrontPHPHTTPSink) called at [<phabricator>/webroot/index.php:35]'
```
Code in https://we.phorge.it/source/phorge/browse/master/src/applications/diffusion/controller/DiffusionBlameController.php basically does:
```
$identifiers = array_fuse($blame);
if ($identifiers) {
...
} else {
$commits = array();
}
...
$epochs = array();
foreach ($identifiers as $identifier) {
...
if ($commit) {
$epoch = $commit->getEpoch();
} else {
$epoch = 0;
}
$epochs[] = $epoch;
}
...
$epoch_min = min($epochs);
$epoch_max = max($epochs);
```
`$epochs` can still be an empty array, as `$epoch = 0` is only set when `$identifiers` is not `null`.