Unable to open Mattermost UI

@chhitz wrote:

After the update to Mattermost 3.10 (with the Gtilab 9.3 release) I'm not able to open the Mattermost UI anymore. I get the following JS error:

team_button.jsx:55 Uncaught (in promise) TypeError: Cannot read property 'substring' of undefined
    at t.value (team_button.jsx:55)
    at d._renderValidatedComponentWithoutOwnerOrContext (ReactCompositeComponent.js:803)
    at d._renderValidatedComponent (ReactCompositeComponent.js:826)
    at d.performInitialMount (ReactCompositeComponent.js:366)
    at d.mountComponent (ReactCompositeComponent.js:262)
    at Object.mountComponent (ReactReconciler.js:50)
    at h.mountChildren (ReactMultiChild.js:242)
    at h._createInitialChildren (ReactDOMComponent.js:701)
    at h.mountComponent (ReactDOMComponent.js:520)
    at Object.mountComponent (ReactReconciler.js:50)

I am the admin of the Mattermost server and team. Other users don't see this issue.

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