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diff --git a/src/applications/files/controller/PhabricatorFileTransformController.php b/src/applications/files/controller/PhabricatorFileTransformController.php
--- a/src/applications/files/controller/PhabricatorFileTransformController.php
+++ b/src/applications/files/controller/PhabricatorFileTransformController.php
@@ -54,7 +54,18 @@
     if (isset($xforms[$transform])) {
       $xform = $xforms[$transform];
       if ($xform->canApplyTransform($file)) {
-        $xformed_file = $xforms[$transform]->applyTransform($file);
+        try {
+          $xformed_file = $xforms[$transform]->applyTransform($file);
+        } catch (Exception $ex) {
+          // TODO: Provide a diagnostic mode to surface these to the viewer.
+
+          // In normal transform mode, we ignore failures and generate a
+          // default transform instead.
+        }
+      }
+
+      if (!$xformed_file) {
+        $xformed_file = $xform->getDefaultTransform($file);
       }
     }
 
diff --git a/src/applications/files/transform/PhabricatorFileThumbnailTransform.php b/src/applications/files/transform/PhabricatorFileThumbnailTransform.php
--- a/src/applications/files/transform/PhabricatorFileThumbnailTransform.php
+++ b/src/applications/files/transform/PhabricatorFileThumbnailTransform.php
@@ -71,4 +71,20 @@
     }
   }
 
+  public function getDefaultTransform(PhabricatorFile $file) {
+    $x = (int)$this->dstX;
+    $y = (int)$this->dstY;
+    $name = 'image-'.$x.'x'.nonempty($y, $x).'.png';
+
+    $params = array(
+      'name' => $name,
+      'canCDN' => true,
+    );
+
+    $root = dirname(phutil_get_library_root('phabricator'));
+    $data = Filesystem::readFile($root.'/resources/builtin/'.$name);
+
+    return PhabricatorFile::newFromFileData($data, $params);
+  }
+
 }
diff --git a/src/applications/files/transform/PhabricatorFileTransform.php b/src/applications/files/transform/PhabricatorFileTransform.php
--- a/src/applications/files/transform/PhabricatorFileTransform.php
+++ b/src/applications/files/transform/PhabricatorFileTransform.php
@@ -7,6 +7,10 @@
   abstract public function canApplyTransform(PhabricatorFile $file);
   abstract public function applyTransform(PhabricatorFile $file);
 
+  public function getDefaultTransform(PhabricatorFile $file) {
+    return null;
+  }
+
   public function generateTransforms() {
     return array($this);
   }