Caused by: java.lang.NullPointerException
        at java.base/java.util.Objects.requireNonNull(Objects.java:221)
        at java.base/java.lang.String.join(String.java:2440)
        at org.ametys.plugins.mobileapp.FeedHelper.getEventDescription(FeedHelper.java:397)
        at org.ametys.plugins.mobileapp.FeedHelper.getEventInfos(FeedHelper.java:112)
        at org.ametys.plugins.mobileapp.action.GetProjectsFeedAction.doLoggedInAction(GetProjectsFeedAction.java:69)
        at org.ametys.plugins.mobileapp.action.AbstractLoggedAction.doAction(AbstractLoggedAction.java:49)
        at org.ametys.plugins.mobileapp.action.GetProjectsFeedAction.doAction(GetProjectsFeedAction.java:34)
        at org.ametys.plugins.mobileapp.action.AbstractPostAction.act(AbstractPostAction.java:56)
        at org.ametys.plugins.mobileapp.action.GetProjectsFeedAction.act(GetProjectsFeedAction.java:34)
        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.process(ConcreteTreeProcessor.java:178)
        at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:254)
        at org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:118)