diff --git a/ChangeLog b/ChangeLog
index e079ecee7..4f6ab6623 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -38,6 +38,8 @@
    substitution (thanks to Michelle Crane).
  + Fixed problem with command line configuration overrides that had no
    values. 
+ + Fixed bug #444, which made task shell unusable after canceling out of an
+   undo command.
 
 ------ old releases ------------------------------
 
diff --git a/src/TDB.cpp b/src/TDB.cpp
index 2429cdcbf..856a0cbd5 100644
--- a/src/TDB.cpp
+++ b/src/TDB.cpp
@@ -933,7 +933,11 @@ void TDB::undo ()
 
   // Output displayed, now confirm.
   if (!confirm ("The undo command is not reversible.  Are you sure you want to revert to the previous state?"))
-    throw std::string ("No changes made.");
+  {
+    std::cout << "No changes made." << std::endl;
+    context.hooks.trigger ("post-undo");
+    return;
+  }
 
   // Extract identifying uuid.
   std::string uuid;