1 files changed, 3 insertions, 1 deletions
diff --git a/src/taskmanager.cc b/src/taskmanager.cc
index 2dda0e0..b50e9a6 100644
--- a/src/taskmanager.cc
+++ b/src/taskmanager.cc
@@ -94,7 +94,9 @@ TaskIdList TaskManager::moveTask(taskid_t id, taskid_t to)
 TaskIdList TaskManager::removeTask(taskid_t id) 
   throw (std::exception) {
   TaskIdList affectedTasks;
-  
+
+  if(tree.bfs(id).size() > 1) throw std::exception();
+
   try {
     affectedTasks = tree.remove(id);
   }