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java.lang.NullPointerException: null at org.richfaces.renderkit.ExtendedDataTableRenderer.encodeHeaderOrFooterCell(ExtendedDataTableRenderer.java:275)[richfaces-4.5.13.Final.jar:4.5.13.Final] at org.richfaces.renderkit.ExtendedDataTableRenderer.encodeHeaderOrFooter(ExtendedDataTableRenderer.java:378)[richfaces-4.5.13.Final.jar:4.5.13.Final] at org.richfaces.renderkit.ExtendedDataTableRenderer.encodeHeader(ExtendedDataTableRenderer.java:466)[richfaces-4.5.13.Final.jar:4.5.13.Final] at org.richfaces.renderkit.ExtendedDataTableRenderer.doEncodeChildren(ExtendedDataTableRenderer.java:725)[richfaces-4.5.13.Final.jar:4.5.13.Final]