Uncaught TypeError: Cannot set property updatePosition

I meet a strange question and I can't find out the reason. This problem appear after I updated a npm package. Can someone give me some promote?
```
makeAssimilatePrototype.js:21 Uncaught TypeError: Cannot set property updatePosition of # which has only a getter
at patchProperty (webpack:///./~/react-hot-api/modules/makeAssimilatePrototype.js?:21:16)
at eval (webpack:///./~/react-hot-api/modules/makeAssimilatePrototype.js?:52:9)
at Array.forEach (native)
at eval (webpack:///./~/react-hot-api/modules/makeAssimilatePrototype.js?:51:51)
at Array.forEach (native)
at reconcileWithStoredPrototypes (webpack:///./~/react-hot-api/modules/makeAssimilatePrototype.js?:50:21)
at assimilatePrototype (webpack:///./~/react-hot-api/modules/makeAssimilatePrototype.js?:63:5)
at patchReactClass (webpack:///./~/react-hot-api/modules/makePatchReactClass.js?:40:5)
at Object.makeHot (webpack:///./~/react-hot-api/modules/makeMakeHot.js?:33:12)
at makeExportsHot (webpack:///./~/react-hot-loader/makeExportsHot.js?:44:26)
```

My ENV
- node v7.7.3
- npm 4.1.2

Start at makeAssimilatePrototype.js:21, where the updatePosition assignment fails, and follow the surrounding calls in the stack trace through react-hot-api. Reproduce it with the listed Node v7.7.3 environment after the npm package update; done means the TypeError is explained and no longer occurs.

Written by the indexing model from the issue text.