From 5e25f25ce24ea914fcd0efec88d5ea68f298eee9 Mon Sep 17 00:00:00 2001
From: Andrey Kunchev <donandren@gmail.com>
Date: Fri, 2 Nov 2018 10:36:21 +0200
Subject: [PATCH] fix local cake script build

---
 parameters.cake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/parameters.cake b/parameters.cake
index d13e503bd0..4ef7e8e05a 100644
--- a/parameters.cake
+++ b/parameters.cake
@@ -64,7 +64,7 @@ public class Parameters
         IsPullRequest = buildSystem.AppVeyor.Environment.PullRequest.IsPullRequest;
         IsMainRepo = StringComparer.OrdinalIgnoreCase.Equals(MainRepo, context.EnvironmentVariable("BUILD_REPOSITORY_URI"));
         IsMasterBranch = StringComparer.OrdinalIgnoreCase.Equals(MasterBranch, context.EnvironmentVariable("BUILD_SOURCEBRANCHNAME"));
-        IsReleaseBranch = context.EnvironmentVariable("BUILD_SOURCEBRANCH").ToLower().StartsWith(ReleaseBranchPrefix.ToLower());
+        IsReleaseBranch = (context.EnvironmentVariable("BUILD_SOURCEBRANCH")??"").StartsWith(ReleaseBranchPrefix, StringComparison.OrdinalIgnoreCase);
         IsTagged = buildSystem.AppVeyor.Environment.Repository.Tag.IsTag 
                 && !string.IsNullOrWhiteSpace(buildSystem.AppVeyor.Environment.Repository.Tag.Name);
         IsReleasable = StringComparer.OrdinalIgnoreCase.Equals(ReleaseConfiguration, Configuration);