Using mapped properties in primitive give an error when selecting the entity

[vincentfretin]

Modify the index.html example to add fog="true" like this:

<a-box id="box" position="0 2 0" height="2" color="#FFC65D" fog="true"></a-box>

When you click on the yellow box, the panels disappear and you get the following errors:

Uncaught TypeError: Cannot use 'in' operator to search for 'color' in true
    at PropertyRow.render (PropertyRow.js:141:21)
    at finishClassComponent (react-dom.development.js:19752:1)
    at updateClassComponent (react-dom.development.js:19698:1)
    at beginWork (react-dom.development.js:21611:1)
    at HTMLUnknownElement.callCallback (react-dom.development.js:4164:1)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:4213:1)
    at invokeGuardedCallback (react-dom.development.js:4277:1)
    at beginWork$1 (react-dom.development.js:27451:1)
    at performUnitOfWork (react-dom.development.js:26560:1)
    at workLoopSync (react-dom.development.js:26466:1)
PropertyRow.js:141 Uncaught TypeError: Cannot use 'in' operator to search for 'density' in true
    at PropertyRow.render (PropertyRow.js:141:21)
    at finishClassComponent (react-dom.development.js:19752:1)
    at updateClassComponent (react-dom.development.js:19698:1)
    at beginWork (react-dom.development.js:21611:1)
    at HTMLUnknownElement.callCallback (react-dom.development.js:4164:1)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:4213:1)
    at invokeGuardedCallback (react-dom.development.js:4277:1)
    at beginWork$1 (react-dom.development.js:27451:1)
    at performUnitOfWork (react-dom.development.js:26560:1)
    at workLoopSync (react-dom.development.js:26466:1)
...

a-box here is a primitive and fog="true" is mapped to material.fog.

This is working:

<a-box id="box" position="0 2 0" height="2" color="#FFC65D" material="fog:true"></a-box>

[vincentfretin]

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