complex key is not valid because it contains null values
java.lang.RuntimeException: complex key is not valid because it contains null values
    at org.ametys.plugins.core.impl.cache.GuavaCache.put(GuavaCache.java:174)
    at org.ametys.web.tags.inputdata.FilteredContentsInputData.updateFile(FilteredContentsInputData.java:264)
    at org.ametys.core.util.filereloader.FileReloaderUtils.updateFile(FileReloaderUtils.java:153)
    at org.ametys.core.util.filereloader.FileReloaderUtils.updateFile(FileReloaderUtils.java:89)
    at org.ametys.web.tags.inputdata.FilteredContentsInputData.configureFilters(FilteredContentsInputData.java:169)
    at org.ametys.web.tags.inputdata.FilteredContentsInputData.isCacheable(FilteredContentsInputData.java:120)
    at org.ametys.web.cache.PageHelper.isCacheable(PageHelper.java:133)
    at org.ametys.web.site.SiteStatisticsAction._processPages(SiteStatisticsAction.java:313)
    at org.ametys.web.site.SiteStatisticsAction._sitemap2json(SiteStatisticsAction.java:279)
    at org.ametys.web.site.SiteStatisticsAction.act(SiteStatisticsAction.java:101)
    at org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode.invoke(ActTypeNode.java:125)
    at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:47)
    at org.apache.cocoon.components.treeprocessor.sitemap.MatchNode.invoke(MatchNode.java:108)
    at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:69)
    at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:143)
    at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:69)
    at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:93)
    at org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:236)
    at org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.buildPipeline(ConcreteTreeProcessor.java:194)
    at org.apache.cocoon.components.treeprocessor.TreeProcessor.buildPipeline(TreeProcessor.java:267)