java.lang.NullPointerException: This exception has no message.

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This exception has no message.
at org.primefaces.util.ResourceUtils.filterStylesheets(
at org.primefaces.context.PrimePartialResponseWriter.startMetadataIfNecessary(
at org.primefaces.context.PrimePartialResponseWriter.startUpdate(
at org.omnifaces.context.OmniPartialViewContext$OmniPartialResponseWriter.startUpdate(
at com.sun.faces.context.PartialViewContextImpl.renderState(
at javax.faces.context.PartialViewContextWrapper.processPartial(
at org.omnifaces.context.OmniPartialViewContext.processPartial(
at javax.faces.component.UIViewRoot.encodeChildren(
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(
at javax.faces.application.ViewHandlerWrapper.renderView(
at org.omnifaces.viewhandler.OmniViewHandler.renderView(
at javax.faces.application.ViewHandlerWrapper.renderView(
at com.sun.faces.lifecycle.RenderResponsePhase.execute(
at com.sun.faces.lifecycle.Phase.doPhase(

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