diff --git a/src/applications/maniphest/xaction/ManiphestTaskTitleTransaction.php b/src/applications/maniphest/xaction/ManiphestTaskTitleTransaction.php
--- a/src/applications/maniphest/xaction/ManiphestTaskTitleTransaction.php
+++ b/src/applications/maniphest/xaction/ManiphestTaskTitleTransaction.php
@@ -64,9 +64,27 @@
   public function validateTransactions($object, array $xactions) {
     $errors = array();
 
-    if ($this->isEmptyTextTransaction($object->getTitle(), $xactions)) {
-      $errors[] = $this->newRequiredError(
-        pht('Tasks must have a title.'));
+    // If the user is acting via "Bulk Edit" or another workflow which
+    // continues on missing fields, they may be applying a transaction which
+    // removes the task title. Mark these transactions as invalid first,
+    // then flag the missing field error if we don't find any more specific
+    // problems.
+
+    foreach ($xactions as $xaction) {
+      $new = $xaction->getNewValue();
+      if (!strlen($new)) {
+        $errors[] = $this->newInvalidError(
+          pht('Tasks must have a title.'),
+          $xaction);
+        continue;
+      }
+    }
+
+    if (!$errors) {
+      if ($this->isEmptyTextTransaction($object->getTitle(), $xactions)) {
+        $errors[] = $this->newRequiredError(
+          pht('Tasks must have a title.'));
+      }
     }
 
     return $errors;