diff --git a/www/_util/PileDB.php b/www/_util/PileDB.php
index 560edea..6813904 100644
--- a/www/_util/PileDB.php
+++ b/www/_util/PileDB.php
@@ -64,7 +64,7 @@ class PileDB
     /**
      * Fetch pile document as an associative array.
      *
-     * @throws DocumentNotFoundException when document isn't found.
+     * @throws NotFoundException when document isn't found.
      */
     public function fetchDoc($id)
     {
@@ -72,7 +72,7 @@ class PileDB
         $stmt_doc->bindValue(":id", $id, SQLITE3_INTEGER);
         $doc = $stmt_doc->execute()->fetchArray(SQLITE3_ASSOC);
         if ($doc == false) {
-            throw new DocumentNotFoundException();
+            throw new NotFoundException();
         }
         $doc["HTMLDescription"] = $this->pd->text($doc["Description"]);
 
@@ -201,11 +201,18 @@ class PileDB
         return $stmt->execute()->fetchArray(SQLITE3_ASSOC);
     }
 
+    /***
+     * Fetches tag as associative array.
+     * @throws NotFoundException
+     */
     public function fetchTag($tag)
     {
         $stmt = $this->db->prepare("SELECT * FROM Tags WHERE ID == :tag");
         $stmt->bindValue(":tag", $tag, SQLITE3_INTEGER);
         $tag = $stmt->execute()->fetchArray(SQLITE3_ASSOC);
+        if ($tag == false) {
+            throw new NotFoundException();
+        }
         $tag["HTMLDescription"] = $this->pd->text($tag["Description"]);
         return $tag;
     }
@@ -257,7 +264,7 @@ class PileDB
     }
 }
 
-class DocumentNotFoundException extends Exception
+class NotFoundException extends Exception
 {
     // noop
 }
diff --git a/www/index.php b/www/index.php
index 8457aa4..b125112 100644
--- a/www/index.php
+++ b/www/index.php
@@ -10,7 +10,7 @@ $page = new Template();
 if (isset($_GET["item"])) {
     try {
         $doc = $db->fetchDoc($_GET["item"]);
-    } catch (DocumentNotFoundException $e) {
+    } catch (NotFoundException $e) {
         http_response_code(404);
         $page->text = "Document not found.";
         $page->redirect = "/";
diff --git a/www/label.php b/www/label.php
index 68cc8e8..b0fe9eb 100644
--- a/www/label.php
+++ b/www/label.php
@@ -9,7 +9,7 @@ require '_util/PileDB.php';
 $db = new PileDB();
 try {
     $doc = $db->fetchDoc($_GET["id"]);
-} catch (DocumentNotFoundException $e) {
+} catch (NotFoundException $e) {
     http_response_code(404);
     $page->text = "Document not found.";
     $page->redirect = "/";