From 4cd7d923dfad0eb6d0ac8f8fe26c9ce70e315b6c Mon Sep 17 00:00:00 2001
From: Matthew Brown <github@muglug.com>
Date: Tue, 18 Dec 2018 17:47:28 -0500
Subject: [PATCH] Initialise output to string

---
 src/Psalm/Output/Text.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Psalm/Output/Text.php b/src/Psalm/Output/Text.php
index c2dfe9617..6a097671d 100644
--- a/src/Psalm/Output/Text.php
+++ b/src/Psalm/Output/Text.php
@@ -11,7 +11,7 @@ class Text extends Output
      */
     public function create(): string
     {
-        $output = null;
+        $output = '';
         foreach ($this->issues_data as $issue_data) {
             $output .= sprintf(
                 '%s:%s:%s:%s - %s: %s',