From e5b1ed7a7f7b85c1877e09a9495681f719be5578 Mon Sep 17 00:00:00 2001
From: Dan Field <dfield@gmail.com>
Date: Wed, 6 Mar 2019 14:23:37 -0800
Subject: [PATCH] Fix for post submit on cirrus (#28963)

* Fix for post submit on cirrus
---
 dev/bots/test.dart | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dev/bots/test.dart b/dev/bots/test.dart
index 281a71b295c9b..ea8bb9b96b847 100644
--- a/dev/bots/test.dart
+++ b/dev/bots/test.dart
@@ -422,7 +422,9 @@ String _getCiProviderName() {
 int _getPrNumber() {
   switch(_getCiProvider()) {
     case CiProviders.cirrus:
-      return int.tryParse(Platform.environment['CIRRUS_PR']);
+      return Platform.environment['CIRRUS_PR'] == null
+          ? -1
+          : int.tryParse(Platform.environment['CIRRUS_PR']);
     case CiProviders.luci:
       return -1; // LUCI doesn't know about this.
   }