diff --git a/src/applications/differential/parser/DifferentialChangesetParser.php b/src/applications/differential/parser/DifferentialChangesetParser.php
index 121ecdcbfa..cd970e9cd3 100644
--- a/src/applications/differential/parser/DifferentialChangesetParser.php
+++ b/src/applications/differential/parser/DifferentialChangesetParser.php
@@ -369,8 +369,9 @@ final class DifferentialChangesetParser {
     $generated_guess = (strpos($new_corpus_block, '@'.'generated') !== false);
 
     if (!$generated_guess) {
-      $config_key = 'differential.generated-paths';
-      $generated_path_regexps = PhabricatorEnv::getEnvConfig($config_key);
+      $generated_path_regexps = PhabricatorEnv::getEnvConfig(
+        'differential.generated-paths',
+        array());
       foreach ($generated_path_regexps as $regexp) {
         if (preg_match($regexp, $this->changeset->getFilename())) {
           $generated_guess = true;