diff --git a/lib/scm/gitrepo.class.php b/lib/scm/gitrepo.class.php
index ad805caf62..1fd46f4fbe 100644
--- a/lib/scm/gitrepo.class.php
+++ b/lib/scm/gitrepo.class.php
@@ -310,7 +310,9 @@ class GitRepo
         if(strpos($fromRevision, '^') !== false)
         {
             $list = execCmd(escapeCmd("$this->client log -2 $toRevision --pretty=format:%H -- $path"), 'array');
-            if(isset($list[1])) $fromRevision = $list[1];
+            if(!isset($list[1])) return execCmd(escapeCmd("$this->client show HEAD"), 'array');
+
+            $fromRevision = $list[1];
         }
         $lines = execCmd(escapeCmd("$this->client diff $fromRevision $toRevision -- $path"), 'array');
         return $lines;