React: Advertencia: "Me encontré con dos niños con la misma llave"

La pila de llamadas completa de uno como este a continuación:

warning.js: 45 Advertencia: flattenChildren (...): Se encontraron dos niños con la misma clave, .$outbox81 . Las claves secundarias deben ser únicas; cuando dos niños comparten una clave, solo se usará el primer niño. warning @ warning.js: 45flattenSingleChildIntoContext @ flattenChildren.js: 27traverseAllChildrenImpl @ traverseAllChildren.js: 98traverseAllChildrenImpl @ traverseAllChildren.js: 114Childrenjildren.js : 44_reconcilerUpdateChildren @ ReactMultiChild.js: 212_updateChildren @ ReactMultiChild.js: 351updateChildren @ ReactMultiChild.js: 326_updateDOMChildren @ ReactDOMComponent.js: 871updateComponent @ ReajDOMComponent. backend. en) @ backend.js: 8386updateChildren @ ReactChildReconciler.js: 84_reconcilerUpdateChildren @ ReactMultiChild.js: 216_updateChildren @ ReactMultiChild.js: 351updateChildren @ ReactMultiChild.js: 326_updateDOMChildren @ ReactDOMComponent.js: 871updateComponent @ ReactDOMComponent.js: 700receiveComponent @ ReactDOMComponent.js: 645receiveComponent @ ReactReconciler.js: 87obj. (Función anónima) @ backend.js: 8386updateChildren @ ReactChildReconciler.js: 84_reconcilerUpdateChildren @ ReactMultiChild.js: 216_updateChildren @ ReactMultiChild.js: 351updateChilds. js: 700receiveComponent @ ReactDOMComponent. f.js: 66receiveComponent @ ReactCompositeComponent.js: 405receiveComponent @ ReactReconciler.js: 87obj. (función anónima) @ backend.js: 8386updateChildren @ ReactChildReconciler.js: 84_reconcilerUpdateChildren @ ReactjChildsildi : 326_updateDOMChildren @ ReactDOMComponent.js: 871updateComponent @ ReactDOMComponent.js: 700receiveComponent @ ReactDOMComponent.js: 645receiveComponent @ ReactReconciler.js: 87obj. (Función anónima) @ backend.Chrenjilds_Data: 8 ReactMultiChild.js: 351updateChildren @ ReactMultiChild.js: 326_updateDOMChildren @ ReactDOMComponent.js: 871updateComponent @ ReactDOMComponent.js: 700receiveComponent @ ReactDOMComponent.js: 645jerecentComponent. : 562_performComponentUpdate @ ReactCompos iteComponent.js: 544updateComponent @ ReactCompositeComponent.js: 473ReactCompositeComponent_updateComponent @ ReactPerf.js: 66receiveComponent @ ReactCompositeComponent.js: 405receiveComponent @ ReactReconciler.js: 87obj. : 216_updateChildren @ ReactMultiChild.js: 351updateChildren @ ReactMultiChild.js: 326_updateDOMChildren @ ReactDOMComponent.js: 871updateComponent @ ReactDOMComponent.js: 700receiveComponent @ ReactDOMComponent. ReactChildReconciler.js: 84_reconcilerUpdateChildren @ ReactMultiChild.js: 216_updateChildren @ ReactMultiChild.js: 351updateChildren @ ReactMultiChild.js: 326_updateDOMChildren @ ReactDOMComponent.js: 871updateComponent @ ReactDOMComponent.js: 700receiveComponent @ ReactDOMComponent.js: 645receiveComponent @ ReactReconciler.js:. 87obj (anónimo func ción) @ backend.js: 8386_updateRenderedComponent @ ReactCompositeComponent.js: 562_performComponentUpdate @ ReactCompositeComponent.js: 544updateComponent @ ReactCompositeComponent.js: 473ReactCompositeComponent_updateComponent.j backend.js: 8386_updateRenderedComponent @ ReactCompositeComponent.js: 562_performComponentUpdate @ ReactCompositeComponent.js: 544updateComponent @ ReactCompositeComponent.js: 473ReactCompositeComponent_updateComponent @ ReactPerf.js: 66receiveComponent @ ReactCompositeComponent.js: 405receiveComponent @ ReactReconciler.js:. 87obj (función anónima) @ backend.js : 8386updateChildren @ ReactChildReconciler.js: 84_reconcilerUpdateChildren @ ReactMultiChild.js: 216_updateChildren @ ReactMultiChild.js: 351updateChildren @ ReactMultiChild.js: 326_updateDOMChildComponent. eactDOMComponent.js: 645receiveComponent @ ReactReconciler.js:. 87obj (función anónima) @ backend.js: 8386_updateRenderedComponent @ ReactCompositeComponent.js: 562_performComponentUpdate @ ReactCompositeComponent.js: 544updateComponent @ ReactCompositeComponent.js: 473ReactCompositeComponent_updateComponent @ ReactPerf.js: 66receiveComponent @ ReactCompositeComponent.js : @ 405receiveComponent ReactReconciler.js:. 87obj (función anónima) @ backend.js: 8386_updateRenderedComponent @ ReactCompositeComponent.js: 562_performComponentUpdate @ ReactCompositeComponent.js: 544updateComponent @ ReactCompositeComponent.js: 473ReactCompositeComponent_updateComponent @ ReactPerf.js: 66performUpdateIfNecessary @ ReactCompositeComponent.js: 421performUpdateIfNecessary @ ReactReconciler.js: 102obj. (Función anónima) @ backend.js: 8386runBatchedUpdates @ ReactUpdates.js: 129perform @ Transaction.js: 136perform @ Transaction.js: 136perform @ ReactUpdates.js: 86flushBatchedUpdates @ ReactUpdates. shBatchedUpdates @ ReactPerf.js: 66closeAll @ Transaction.js: 202perform @ Transaction.js: 149batchedUpdates @ ReactDefaultBatchingStrategy.js: 62enqueueUpdate @ ReactUpdates.js: 176enqueueUpdate @ ReactUpdateQueuejstatespone: 190 65handleChange @ connect.js: 301dispatch @ createStore.js: 186 (función anónima) @ api.js: 91 (función anónima) @ index.js: 15 (función anónima) @ middleware.js: 22 (función anónima) @ bindActionCreators. js: 7hide @ index.js: 743handleDocumentClick @ index.js: 519
warning.js: 45 Advertencia: flattenChildren (...): Se encontraron dos niños con la misma clave, .$outbox80 . Las claves secundarias deben ser únicas; cuando dos niños comparten una clave, solo se usará el primer niño.warning @ warning.js: 45flattenSingleChildIntoContext @ flattenChildren.js: 27traverseAllChildrenImpl @ traverseAllChildren.js: 98traverseAllChildrenImpl @ traverseAllChildren.js: 114Childrenjildren.js. : 44_reconcilerUpdateChildren @ ReactMultiChild.js: 212_updateChildren @ ReactMultiChild.js: 351updateChildren @ ReactMultiChild.js: 326_updateDOMChildren @ ReactDOMComponent.js: 871updateComponent @ ReajDOMComponent. backend. en) @ backend.js: 8386updateChildren @ ReactChildReconciler.js: 84_reconcilerUpdateChildren @ ReactMultiChild.js: 216_updateChildren @ ReactMultiChild.js: 351updateChildren @ ReactMultiChild.js: 326_updateDOMChildren @ ReactDOMComponent.js: 871updateComponent @ ReactDOMComponent.js: 700receiveComponent @ ReactDOMComponent.js: 645receiveComponent @ ReactReconciler.js: 87obj. (Función anónima) @ backend.js: 8386updateChildren @ ReactChildReconciler.js: 84_reconcilerUpdateChildren @ ReactMultiChild.js: 216_updateChildren @ ReactMultiChild.js: 351updateChilds. js: 700receiveComponent @ ReactDOMComponent. f.js: 66receiveComponent @ ReactCompositeComponent.js: 405receiveComponent @ ReactReconciler.js: 87obj. (función anónima) @ backend.js: 8386updateChildren @ ReactChildReconciler.js: 84_reconcilerUpdateChildren @ ReactjChildsildi : 326_updateDOMChildren @ ReactDOMComponent.js: 871updateComponent @ ReactDOMComponent.js: 700receiveComponent @ ReactDOMComponent.js: 645receiveComponent @ ReactReconciler.js: 87obj. (Función anónima) @ backend.Chrenjilds_Data: 8 ReactMultiChild.js: 351updateChildren @ ReactMultiChild.js: 326_updateDOMChildren @ ReactDOMComponent.js: 871updateComponent @ ReactDOMComponent.js: 700receiveComponent @ ReactDOMComponent.js: 645jerecentComponent. : 562_performComponentUpdate @ ReactCompos iteComponent.js: 544updateComponent @ ReactCompositeComponent.js: 473ReactCompositeComponent_updateComponent @ ReactPerf.js: 66receiveComponent @ ReactCompositeComponent.js: 405receiveComponent @ ReactReconciler.js: 87obj. : 216_updateChildren @ ReactMultiChild.js: 351updateChildren @ ReactMultiChild.js: 326_updateDOMChildren @ ReactDOMComponent.js: 871updateComponent @ ReactDOMComponent.js: 700receiveComponent @ ReactDOMComponent. ReactChildReconciler.js: 84_reconcilerUpdateChildren @ ReactMultiChild.js: 216_updateChildren @ ReactMultiChild.js: 351updateChildren @ ReactMultiChild.js: 326_updateDOMChildren @ ReactDOMComponent.js: 871updateComponent @ ReactDOMComponent.js: 700receiveComponent @ ReactDOMComponent.js: 645receiveComponent @ ReactReconciler.js:. 87obj (anónimo func ción) @ backend.js: 8386_updateRenderedComponent @ ReactCompositeComponent.js: 562_performComponentUpdate @ ReactCompositeComponent.js: 544updateComponent @ ReactCompositeComponent.js: 473ReactCompositeComponent_updateComponent.j backend.js: 8386_updateRenderedComponent @ ReactCompositeComponent.js: 562_performComponentUpdate @ ReactCompositeComponent.js: 544updateComponent @ ReactCompositeComponent.js: 473ReactCompositeComponent_updateComponent @ ReactPerf.js: 66receiveComponent @ ReactCompositeComponent.js: 405receiveComponent @ ReactReconciler.js:. 87obj (función anónima) @ backend.js : 8386updateChildren @ ReactChildReconciler.js: 84_reconcilerUpdateChildren @ ReactMultiChild.js: 216_updateChildren @ ReactMultiChild.js: 351updateChildren @ ReactMultiChild.js: 326_updateDOMChildComponent. eactDOMComponent.js: 645receiveComponent @ ReactReconciler.js:. 87obj (función anónima) @ backend.js: 8386_updateRenderedComponent @ ReactCompositeComponent.js: 562_performComponentUpdate @ ReactCompositeComponent.js: 544updateComponent @ ReactCompositeComponent.js: 473ReactCompositeComponent_updateComponent @ ReactPerf.js: 66receiveComponent @ ReactCompositeComponent.js : @ 405receiveComponent ReactReconciler.js:. 87obj (función anónima) @ backend.js: 8386_updateRenderedComponent @ ReactCompositeComponent.js: 562_performComponentUpdate @ ReactCompositeComponent.js: 544updateComponent @ ReactCompositeComponent.js: 473ReactCompositeComponent_updateComponent @ ReactPerf.js: 66performUpdateIfNecessary @ ReactCompositeComponent.js: 421performUpdateIfNecessary @ ReactReconciler.js: 102obj. (Función anónima) @ backend.js: 8386runBatchedUpdates @ ReactUpdates.js: 129perform @ Transaction.js: 136perform @ Transaction.js: 136perform @ ReactUpdates.js: 86flushBatchedUpdates @ ReactUpdates. shBatchedUpdates @ ReactPerf.js: 66closeAll @ Transaction.js: 202perform @ Transaction.js: 149batchedUpdates @ ReactDefaultBatchingStrategy.js: 62enqueueUpdate @ ReactUpdates.js: 176enqueueUpdate @ ReactUpdateQueuejstatespone: 190 65handleChange @ connect.js: 301dispatch @ createStore.js: 186 (función anónima) @ api.js: 91 (función anónima) @ index.js: 15 (función anónima) @ middleware.js: 22 (función anónima) @ bindActionCreators. js: 7hide @ index.js: 743handleDocumentClick @ index.js: 519

Lo siento, es mi error.

¿Puedes decirme cuál fue el problema real? Tengo las mismas advertencias cuando llamo a la lista plana del método onReachEnd