diff --git a/src/main/java/org/olat/course/nodes/gta/manager/GTAManagerImpl.java b/src/main/java/org/olat/course/nodes/gta/manager/GTAManagerImpl.java
index afd8063f77fe537e7c2aa72db48de37ce57f4c8d..6bedc4ffa3237fa81cd7200d92f5bb9d532a2d46 100644
--- a/src/main/java/org/olat/course/nodes/gta/manager/GTAManagerImpl.java
+++ b/src/main/java/org/olat/course/nodes/gta/manager/GTAManagerImpl.java
@@ -1487,6 +1487,8 @@ public class GTAManagerImpl implements GTAManager {
 		TaskImpl taskImpl = (TaskImpl)task;
 		taskImpl.setSubmissionDate(new Date());
 		taskImpl.setSubmissionNumOfDocs(numOfDocs);
+		taskImpl.setCollectionDate(null);
+		taskImpl.setCollectionNumOfDocs(null);
 		return updateTask(task, review, cNode, by);
 	}