Showing up in the logs on beta cluster:

[2015-04-28 03:29:06] Fatal error: Call to a member function equals() on a non-object at /mnt/srv/mediawiki-staging/php-master/extensions/Echo/Hooks.php on line 745
Server: deployment-bastion
URL: http://[unknown-host]
Backtrace:
#0 /mnt/srv/mediawiki-staging/php-master/extensions/Echo/Hooks.php(745): EchoHooks::makeGlobalVariablesScript()
#1 [internal function]: EchoHooks::makeGlobalVariablesScript(Array, Object(OutputPage))
#2 /mnt/srv/mediawiki-staging/php-master/includes/Hooks.php(209): call_user_func_array('EchoHooks::make...', Array)
#3 /mnt/srv/mediawiki-staging/php-master/maintenance/eval.php(78) : eval()'d code(1): Hooks::run('MakeGlobalVaria...', Array)
#4 /mnt/srv/mediawiki-staging/php-master/maintenance/eval.php(78): eval()
#5 /mnt/srv/mediawiki-staging/multiversion/MWScript.php(97): require_once('/mnt/srv/mediaw...')
#6 {main}