Warning: `div` was passed a style object that has previously been mutated.

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How can fix it error?

Warning: `div` was passed a style object that has previously been mutated. Mutating `style` is deprecated. Consider cloning it beforehand. Check the `render` of `Modal`. Previous style: {zIndex: NaN}. Mutated style: {zIndex: NaN}.
warning @ warning.js:45
checkAndWarnForMutatedStyle @ ReactDOMComponent.js:186
_updateDOMProperties @ ReactDOMComponent.js:770
updateComponent @ ReactDOMComponent.js:699
receiveComponent @ ReactDOMComponent.js:645
receiveComponent @ ReactReconciler.js:87
_updateRenderedComponent @ ReactCompositeComponent.js:562
_performComponentUpdate @ ReactCompositeComponent.js:544
updateComponent @ ReactCompositeComponent.js:473
ReactCompositeComponent_updateComponent @ ReactPerf.js:66
performUpdateIfNecessary @ ReactCompositeComponent.js:421
performUpdateIfNecessary @ ReactReconciler.js:102
runBatchedUpdates @ ReactUpdates.js:129
perform @ Transaction.js:136
perform @ Transaction.js:136
perform @ ReactUpdates.js:86
flushBatchedUpdates @ ReactUpdates.js:147
ReactUpdates_flushBatchedUpdates @ ReactPerf.js:66
closeAll @ Transaction.js:202
perform @ Transaction.js:149
batchedUpdates @ ReactDefaultBatchingStrategy.js:62
enqueueUpdate @ ReactUpdates.js:176
enqueueUpdate @ ReactUpdateQueue.js:24
enqueueSetState @ ReactUpdateQueue.js:190
ReactComponent.setState @ ReactComponent.js:65
safeSetState @ Transition.js:181
(anonymous) @ Transition.js:143
nextCallback @ Transition.js:195
setTimeout (async)
onTransitionEnd @ Transition.js:212
(anonymous) @ Transition.js:142
nextCallback @ Transition.js:195
notifyAll @ CallbackQueue.js:65
close @ ReactUpdates.js:57
closeAll @ Transaction.js:202
perform @ Transaction.js:149
perform @ ReactUpdates.js:86
flushBatchedUpdates @ ReactUpdates.js:147
ReactUpdates_flushBatchedUpdates @ ReactPerf.js:66
close @ ReactUpdates.js:45
closeAll @ Transaction.js:202
perform @ Transaction.js:149
perform @ ReactUpdates.js:86
flushBatchedUpdates @ ReactUpdates.js:147
ReactUpdates_flushBatchedUpdates @ ReactPerf.js:66
closeAll @ Transaction.js:202
perform @ Transaction.js:149
batchedUpdates @ ReactDefaultBatchingStrategy.js:62
batchedUpdates @ ReactUpdates.js:94
dispatchEvent @ ReactEventListener.js:204
00:35:58.821 polling-xhr.js:264 GET https://testing-ws2.helptalks.ru/socket.io/?auth_token=Wzc2MiwxNDk2MzE0ODQ2LjM0NTAwOF0.Ra6yfxW9_jEV4XUeKVTO-E4emak&EIO=3&transport=polling&t=LnWRk9h 504 (Gateway Time-out)
Request.create @ polling-xhr.js:264
Request @ polling-xhr.js:165
XHR.request @ polling-xhr.js:92
XHR.doPoll @ polling-xhr.js:122
Polling.poll @ polling.js:118
Polling.doOpen @ polling.js:63
Transport.open @ transport.js:80
Socket.open @ socket.js:246
Socket @ socket.js:120
Socket @ socket.js:29
Manager.open.Manager.connect @ manager.js:226
Manager @ manager.js:69
Manager @ manager.js:37
lookup @ index.js:60
setSocket @ App.js:103
componentDidMount @ App.js:199
notifyAll @ CallbackQueue.js:65
close @ ReactReconcileTransaction.js:81
closeAll @ Transaction.js:202
perform @ Transaction.js:149
batchedMountComponentIntoNode @ ReactMount.js:282
perform @ Transaction.js:136
batchedUpdates @ ReactDefaultBatchingStrategy.js:62
batchedUpdates @ ReactUpdates.js:94
_renderNewRootComponent @ ReactMount.js:476
ReactMount__renderNewRootComponent @ ReactPerf.js:66
_renderSubtreeIntoContainer @ ReactMount.js:550
render @ ReactMount.js:570
React_render @ ReactPerf.js:66
(anonymous) @ index.js:20
__webpack_require__ @ bootstrap 7d35664…:19
(anonymous) @ bootstrap 7d35664…:39
(anonymous) @ bootstrap 7d35664…:39