Caused by: java.lang.NullPointerException: Cannot invoke "org.ametys.core.user.UserIdentity.equals(Object)" because "author1" is null
at org.ametys.plugins.repository.activities.DefaultActivityType#isMergeable:109
at org.ametys.plugins.workspaces.activities.AbstractWorkspacesActivityType#isMergeable:121
at org.ametys.plugins.repository.activities.ActivityTypeExtensionPoint#mergeActivities:60
at org.ametys.plugins.workspaces.activities.activitystream.ActivityStreamClientInteraction#getActivities:137
at org.ametys.plugins.workspaces.activities.activitystream.ActivityStreamClientInteraction#getActivitiesForCurrentUser:385
at org.ametys.plugins.workspaces.activities.activitystream.ActivityStreamClientInteraction#getActivitiesForCurrentUser:362
at org.ametys.plugins.workspaces.activities.activitystream.ActivityStreamServiceAction#act:111
at org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode#invoke:125
at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode#invokeNodes:47
at org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode#invoke:139
at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode#invokeNodes:47
at org.apache.cocoon.components.treeprocessor.sitemap.MatchNode#invoke:108
at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode#invokeNodes:69
at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode#invoke:143
at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode#invokeNodes:69
at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode#invoke:93
at org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor#process:236
at org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor#process:178
at org.apache.cocoon.components.treeprocessor.TreeProcessor#process:254
at org.apache.cocoon.components.treeprocessor.sitemap.MountNode#invoke:118
... 78 more
Maybe there is an activity in one of the workspaces that doesn't contain the author node