diff --git a/src/applications/project/controller/PhabricatorProjectProfileController.php b/src/applications/project/controller/PhabricatorProjectProfileController.php
--- a/src/applications/project/controller/PhabricatorProjectProfileController.php
+++ b/src/applications/project/controller/PhabricatorProjectProfileController.php
@@ -261,12 +261,17 @@
       }
     }
 
-    $view->addAction(
-      id(new PhabricatorActionView())
-        ->setIcon('fa-book grey')
-        ->setName(pht('View Wiki'))
-        ->setWorkflow(true)
-        ->setHref('/project/wiki/'));
+    $have_phriction = PhabricatorApplication::isClassInstalledForViewer(
+      'PhabricatorPhrictionApplication',
+      $viewer);
+    if ($have_phriction) {
+      $view->addAction(
+        id(new PhabricatorActionView())
+          ->setIcon('fa-book grey')
+          ->setName(pht('View Wiki'))
+          ->setWorkflow(true)
+          ->setHref('/project/wiki/'));
+    }
 
     return $view;
   }