diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index fe6f385..45e0fc9 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -48,4 +48,5 @@ jobs:
       - name: Run test suite
         run: |
           git fetch --unshallow
+          git pull
           phpunit --debug
diff --git a/src/Repo.php b/src/Repo.php
index 3f5b429..d1320e2 100644
--- a/src/Repo.php
+++ b/src/Repo.php
@@ -71,9 +71,9 @@ class Repo
     private string $platform = '';
 
     /**
-     * @var string
+     * @var string|null
      */
-    private string $currentBranch = '';
+    private ?string $currentBranch = null;
 
     /**
      * @var string 'commitId message'