diff --git a/src/browse/query/ArcanistBrowseObjectNameURIHardpointQuery.php b/src/browse/query/ArcanistBrowseObjectNameURIHardpointQuery.php
--- a/src/browse/query/ArcanistBrowseObjectNameURIHardpointQuery.php
+++ b/src/browse/query/ArcanistBrowseObjectNameURIHardpointQuery.php
@@ -15,7 +15,7 @@
     $token_set = array();
     foreach ($refs as $key => $ref) {
       $token = $ref->getToken();
-      if (!strlen($token)) {
+      if (!phutil_nonempty_string($token)) {
         continue;
       }
 
@@ -41,7 +41,7 @@
         continue;
       }
 
-      $uri = idx($object, 'uri');
+      $uri = idx($object, 'uri', '');
       if (!strlen($uri)) {
         continue;
       }
diff --git a/src/browse/workflow/ArcanistBrowseWorkflow.php b/src/browse/workflow/ArcanistBrowseWorkflow.php
--- a/src/browse/workflow/ArcanistBrowseWorkflow.php
+++ b/src/browse/workflow/ArcanistBrowseWorkflow.php
@@ -142,7 +142,7 @@
     if ($many_hits) {
       foreach ($many_hits as $ref) {
         $token = $ref->getToken();
-        if (strlen($token)) {
+        if (phutil_nonempty_string($token)) {
           $message = pht('Argument "%s" is ambiguous.', $token);
         } else {
           $message = pht('Default behavior is ambiguous.');
@@ -167,7 +167,7 @@
 
       foreach ($many_hits as $ref) {
         $token_display = $ref->getToken();
-        if (!strlen($token)) {
+        if (!phutil_nonempty_string($token)) {
           $token_display = pht('<default>');
         }
 
diff --git a/src/ref/ArcanistRepositoryRef.php b/src/ref/ArcanistRepositoryRef.php
--- a/src/ref/ArcanistRepositoryRef.php
+++ b/src/ref/ArcanistRepositoryRef.php
@@ -80,7 +80,9 @@
     $params = $params + $defaults;
 
     $uri_base = $this->browseURI;
-    $uri_base = rtrim($uri_base, '/');
+    if ($uri_base !== null) {
+      $uri_base = rtrim($uri_base, '/');
+    }
 
     $uri_branch = phutil_escape_uri_path_component($params['branch']);