diff --git a/app/src/main/java/com/todoroo/astrid/dao/TaskDao.kt b/app/src/main/java/com/todoroo/astrid/dao/TaskDao.kt
index 3eb4a5c08..b9b3504fc 100644
--- a/app/src/main/java/com/todoroo/astrid/dao/TaskDao.kt
+++ b/app/src/main/java/com/todoroo/astrid/dao/TaskDao.kt
@@ -67,6 +67,8 @@ class TaskDao @Inject constructor(
 
     suspend fun setParent(parent: Long, tasks: List<Long>) = taskDao.setParent(parent, tasks)
 
+    suspend fun getChildren(ids: List<Long>) = taskDao.getChildren(ids)
+
     suspend fun getChildren(id: Long): List<Long> = taskDao.getChildren(id)
 
     suspend fun setCollapsed(id: Long, collapsed: Boolean) = taskDao.setCollapsed(id, collapsed)
diff --git a/app/src/main/java/com/todoroo/astrid/service/TaskDuplicator.kt b/app/src/main/java/com/todoroo/astrid/service/TaskDuplicator.kt
index 8b52fc89d..0fbfd743b 100644
--- a/app/src/main/java/com/todoroo/astrid/service/TaskDuplicator.kt
+++ b/app/src/main/java/com/todoroo/astrid/service/TaskDuplicator.kt
@@ -7,6 +7,7 @@ import com.todoroo.astrid.data.Task
 import com.todoroo.astrid.gcal.GCalHelper
 import org.tasks.LocalBroadcastManager
 import org.tasks.data.*
+import org.tasks.db.DbUtils.dbchunk
 import org.tasks.preferences.Preferences
 import java.util.*
 import javax.inject.Inject
@@ -25,7 +26,12 @@ class TaskDuplicator @Inject constructor(
 
     suspend fun duplicate(taskIds: List<Long>): List<Task> {
         val result: MutableList<Task> = ArrayList()
-        for (task in taskDao.fetch(taskIds)) {
+        val tasks = ArrayList(taskIds)
+        taskIds.dbchunk().forEach {
+            tasks.removeAll(googleTaskDao.getChildren(it))
+            tasks.removeAll(taskDao.getChildren(it))
+        }
+        for (task in taskDao.fetch(tasks)) {
             result.add(clone(task))
         }
         localBroadcastManager.broadcastRefresh()