diff --git a/src/applications/maniphest/controller/ManiphestTaskListController.php b/src/applications/maniphest/controller/ManiphestTaskListController.php
index 776eb89e80..1a2eb2a141 100644
--- a/src/applications/maniphest/controller/ManiphestTaskListController.php
+++ b/src/applications/maniphest/controller/ManiphestTaskListController.php
@@ -662,22 +662,24 @@ final class ManiphestTaskListController extends ManiphestController {
     $exclude_project_phids = $request->getStrList('xprojects');
     $task_ids = $request->getStrList('tasks');
 
-    // We only need the integer portion of each task ID, so get rid of any non-
-    // numeric elements
-    $numeric_task_ids = array();
+    if ($task_ids) {
+      // We only need the integer portion of each task ID, so get rid of any
+      // non-numeric elements
+      $numeric_task_ids = array();
 
-    foreach ($task_ids as $task_id) {
-      $task_id = preg_replace('/[a-zA-Z]+/', '', $task_id);
-      if (!empty($task_id)) {
-        $numeric_task_ids[] = $task_id;
+      foreach ($task_ids as $task_id) {
+        $task_id = preg_replace('/[a-zA-Z]+/', '', $task_id);
+        if (!empty($task_id)) {
+          $numeric_task_ids[] = $task_id;
+        }
       }
-    }
 
-    if (empty($numeric_task_ids)) {
-      $numeric_task_ids = array(null);
-    }
+      if (empty($numeric_task_ids)) {
+        $numeric_task_ids = array(null);
+      }
 
-    $task_ids = $numeric_task_ids;
+      $task_ids = $numeric_task_ids;
+    }
 
     $owner_phids = $request->getStrList('owners');
     $author_phids = $request->getStrList('authors');