Java Script error while using Sign Certificate

Magnum-UI version: 12.0.1.dev2

While clicking sign certificate button js error occurs:

TypeError: magnum.getCluster(...).success is not a function
    signCertificateController https://ip/static/dashboard/js/output.467f8e27385a.js:1467
    invoke https://ip/static/dashboard/js/output.43a09e34a303.js:1010
    $controllerInit https://ip/static/dashboard/js/output.43a09e34a303.js:1297
    resolveSuccess https://ip/static/dashboard/js/output.43a09e34a303.js:8017
    processQueue https://ip/static/dashboard/js/output.43a09e34a303.js:1581
    scheduleProcessQueue https://ip/static/dashboard/js/output.43a09e34a303.js:1585
    $digest https://ip/static/dashboard/js/output.43a09e34a303.js:1636
    $apply https://ip/static/dashboard/js/output.43a09e34a303.js:1643
    ngEventHandler https://ip/static/dashboard/js/output.43a09e34a303.js:1937
    dispatch https://ip/static/dashboard/js/output.43a09e34a303.js:336
    handle https://ip/static/dashboard/js/output.43a09e34a303.js:309
 Possibly unhandled rejection: {}

Issue occures on firefox and chrome-based browser.
When working via openstack cli client there is no issue.