diff --git a/src/applications/project/typeahead/PhabricatorProjectDatasource.php b/src/applications/project/typeahead/PhabricatorProjectDatasource.php
--- a/src/applications/project/typeahead/PhabricatorProjectDatasource.php
+++ b/src/applications/project/typeahead/PhabricatorProjectDatasource.php
@@ -21,7 +21,9 @@
     $raw_query = $this->getRawQuery();
 
     // Allow users to type "#qa" or "qa" to find "Quality Assurance".
-    $raw_query = ltrim($raw_query, '#');
+    if ($raw_query) {
+      $raw_query = ltrim($raw_query, '#');
+    }
     $tokens = self::tokenizeString($raw_query);
 
     $query = id(new PhabricatorProjectQuery())
@@ -142,7 +144,7 @@
         $proj_result->addAttribute($proj->getDisplayIconName());
 
         $description = idx($descriptions, $phid);
-        if (strlen($description)) {
+        if (phutil_nonempty_string($description)) {
           $summary = PhabricatorMarkupEngine::summarizeSentence($description);
           $proj_result->addAttribute($summary);
         }
diff --git a/src/applications/typeahead/datasource/PhabricatorTypeaheadCompositeDatasource.php b/src/applications/typeahead/datasource/PhabricatorTypeaheadCompositeDatasource.php
--- a/src/applications/typeahead/datasource/PhabricatorTypeaheadCompositeDatasource.php
+++ b/src/applications/typeahead/datasource/PhabricatorTypeaheadCompositeDatasource.php
@@ -28,7 +28,7 @@
 
     // We only need to do a prefix phase query if there's an actual query
     // string. If the user didn't type anything, nothing can possibly match it.
-    if (strlen($this->getRawQuery())) {
+    if (phutil_nonempty_string($this->getRawQuery())) {
       $phases[] = self::PHASE_PREFIX;
     }
 
diff --git a/src/applications/typeahead/datasource/PhabricatorTypeaheadDatasource.php b/src/applications/typeahead/datasource/PhabricatorTypeaheadDatasource.php
--- a/src/applications/typeahead/datasource/PhabricatorTypeaheadDatasource.php
+++ b/src/applications/typeahead/datasource/PhabricatorTypeaheadDatasource.php
@@ -464,7 +464,11 @@
     // We're looking for a "(" so that a string like "members(q" is identified
     // and parsed as a function call. This allows us to start generating
     // results immediately, before the user fully types out "members(quack)".
-    return (strpos($token, '(') !== false);
+    if ($token) {
+      return (strpos($token, '(') !== false);
+    } else {
+      return false;
+    }
   }