diff --git a/src/applications/dashboard/controller/dashboard/PhabricatorDashboardAdjustController.php b/src/applications/dashboard/controller/dashboard/PhabricatorDashboardAdjustController.php
--- a/src/applications/dashboard/controller/dashboard/PhabricatorDashboardAdjustController.php
+++ b/src/applications/dashboard/controller/dashboard/PhabricatorDashboardAdjustController.php
@@ -32,7 +32,7 @@
 
     $panel_ref = null;
     $panel_key = $request->getStr('panelKey');
-    if (strlen($panel_key)) {
+    if (phutil_nonempty_string($panel_key)) {
       $panel_ref = $ref_list->getPanelRef($panel_key);
       if (!$panel_ref) {
         return new Aphront404Response();
@@ -42,7 +42,7 @@
     }
 
     $column_key = $request->getStr('columnKey');
-    if (strlen($column_key)) {
+    if (phutil_nonempty_string($column_key)) {
       $columns = $ref_list->getColumns();
       if (!isset($columns[$column_key])) {
         return new Aphront404Response();
@@ -52,7 +52,7 @@
 
     $after_ref = null;
     $after_key = $request->getStr('afterKey');
-    if (strlen($after_key)) {
+    if (phutil_nonempty_string($after_key)) {
       $after_ref = $ref_list->getPanelRef($after_key);
       if (!$after_ref) {
         return new Aphront404Response();
diff --git a/src/applications/dashboard/controller/panel/PhabricatorDashboardPanelEditController.php b/src/applications/dashboard/controller/panel/PhabricatorDashboardPanelEditController.php
--- a/src/applications/dashboard/controller/panel/PhabricatorDashboardPanelEditController.php
+++ b/src/applications/dashboard/controller/panel/PhabricatorDashboardPanelEditController.php
@@ -15,7 +15,7 @@
     // editing.
 
     $context_phid = $request->getStr('contextPHID');
-    if (strlen($context_phid)) {
+    if (phutil_nonempty_string($context_phid)) {
       $context = id(new PhabricatorObjectQuery())
         ->setViewer($viewer)
         ->withPHIDs(array($context_phid))
diff --git a/src/applications/dashboard/controller/panel/PhabricatorDashboardPanelTabsController.php b/src/applications/dashboard/controller/panel/PhabricatorDashboardPanelTabsController.php
--- a/src/applications/dashboard/controller/panel/PhabricatorDashboardPanelTabsController.php
+++ b/src/applications/dashboard/controller/panel/PhabricatorDashboardPanelTabsController.php
@@ -41,12 +41,12 @@
 
     $op = $request->getURIData('op');
     $after = $request->getStr('after');
-    if (!strlen($after)) {
+    if (!phutil_nonempty_string($after)) {
       $after = null;
     }
 
     $target = $request->getStr('target');
-    if (!strlen($target)) {
+    if (!phutil_nonempty_string($target)) {
       $target = null;
     }
 
@@ -103,7 +103,7 @@
 
     $context_phid = $request->getStr('contextPHID');
     $context = null;
-    if (strlen($context_phid)) {
+    if (phutil_nonempty_string($context_phid)) {
       $context = id(new PhabricatorObjectQuery())
         ->setViewer($viewer)
         ->withPHIDs(array($context_phid))
diff --git a/src/applications/dashboard/paneltype/PhabricatorDashboardTabsPanelType.php b/src/applications/dashboard/paneltype/PhabricatorDashboardTabsPanelType.php
--- a/src/applications/dashboard/paneltype/PhabricatorDashboardTabsPanelType.php
+++ b/src/applications/dashboard/paneltype/PhabricatorDashboardTabsPanelType.php
@@ -101,7 +101,7 @@
       $subpanel = idx($panels, $panel_id);
 
       $name = idx($tab_spec, 'name');
-      if (!strlen($name)) {
+      if ($name === null || !strlen($name)) {
         if ($subpanel) {
           $name = $subpanel->getName();
         }
diff --git a/src/applications/dashboard/typeahead/PhabricatorDashboardPanelDatasource.php b/src/applications/dashboard/typeahead/PhabricatorDashboardPanelDatasource.php
--- a/src/applications/dashboard/typeahead/PhabricatorDashboardPanelDatasource.php
+++ b/src/applications/dashboard/typeahead/PhabricatorDashboardPanelDatasource.php
@@ -28,7 +28,7 @@
     $query = new PhabricatorDashboardPanelQuery();
 
     $raw_query = $this->getRawQuery();
-    if (preg_match('/^[wW]\d+\z/', $raw_query)) {
+    if ($raw_query !== null && preg_match('/^[wW]\d+\z/', $raw_query)) {
       $id = trim($raw_query, 'wW');
       $id = (int)$id;
       $query->withIDs(array($id));