Caused by: java.lang.NullPointerException: Cannot invoke "java.util.Collection.toArray()" because "c" is null at java.base/java.util.ArrayList.addAll(ArrayList.java:752) at org.ametys.core.ui.UIToolsConfigurationManager.defaultStateToJSON(UIToolsConfigurationManager.java:137) at org.ametys.plugins.core.ui.WorkspaceAction.getUIToolsJSON(WorkspaceAction.java:573) at org.ametys.plugins.core.ui.WorkspaceAction.doGenerate(WorkspaceAction.java:215) at org.ametys.plugins.core.ui.WorkspaceAction.act(WorkspaceAction.java:138) at org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode.invoke(ActTypeNode.java:120)