GithubStore.js

utils.js:14 Uncaught (in promise) Error: [mobx-state-tree] Cannot modify 'GithubStore@<root>', the object is protected and can only be modified by using an action.
    at invariant (utils.js:14)
    at Object.fail (utils.js:6)
    at MSTAdministration.assertWritable (mst-node-administration.js:334)
    at ObjectType.willChange (object.js:76)
    at Array.<anonymous> (object.js:70)
    at interceptChange (mobx.js:1461)
    at setPropertyValue (mobx.js:2383)
    at GithubStore.set [as user] (mobx.js:2363)
    at github.js:34
    at executeAction (mobx.js:660)