From cedbfd48964c3add7071fba594800a3925405502 Mon Sep 17 00:00:00 2001
From: Todd Volkert <tvolkert@users.noreply.github.com>
Date: Fri, 14 Oct 2016 15:43:44 -0700
Subject: [PATCH] Don't crash if we fail to get the flutter or engine revision
 (#6332)

---
 packages/flutter_tools/lib/src/version.dart | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/packages/flutter_tools/lib/src/version.dart b/packages/flutter_tools/lib/src/version.dart
index 59260acd7fa..4ff3859c031 100644
--- a/packages/flutter_tools/lib/src/version.dart
+++ b/packages/flutter_tools/lib/src/version.dart
@@ -107,5 +107,7 @@ String _runSync(String executable, List<String> arguments, String cwd) {
 }
 
 String _shortGitRevision(String revision) {
+  if (revision == null)
+    return '';
   return revision.length > 10 ? revision.substring(0, 10) : revision;
 }