diff --git a/DataStore.py b/DataStore.py
index 233be74..4bfde7f 100644
--- a/DataStore.py
+++ b/DataStore.py
@@ -86,6 +86,9 @@ VALUES (?, ?)
         tasks = self.getTasks(projectid)
         if taskname in tasks.values():
             return False
+        projects = self.getProjects()
+        if not projectid in projects:
+            return False
         nextid = self.getNextId('tasks')
         c.execute('''
 INSERT INTO tasks (id, projectid, name)