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

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This exception has no message.
java.lang.NullPointerException:
at org.primefaces.util.ResourceUtils.filterStylesheets(ResourceUtils.java:96)
at org.primefaces.context.PrimePartialResponseWriter.startMetadataIfNecessary(PrimePartialResponseWriter.java:287)
at org.primefaces.context.PrimePartialResponseWriter.startUpdate(PrimePartialResponseWriter.java:142)
at org.omnifaces.context.OmniPartialViewContext$OmniPartialResponseWriter.startUpdate(OmniPartialViewContext.java:323)
at com.sun.faces.context.PartialViewContextImpl.renderState(PartialViewContextImpl.java:482)
at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219)
at org.omnifaces.context.OmniPartialViewContext.processPartial(OmniPartialViewContext.java:144)
at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:432)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at org.omnifaces.viewhandler.OmniViewHandler.renderView(OmniViewHandler.java:115)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)

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