From f94586e47b4ad09b54e535649f1f9dcb090f2384 Mon Sep 17 00:00:00 2001
From: Ludovic Marcotte <lmarcotte@inverse.ca>
Date: Thu, 14 May 2020 15:46:55 -0400
Subject: [PATCH] fix(eas): avoid doing bogus truncation

---
 ActiveSync/SOGoMailObject+ActiveSync.m | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ActiveSync/SOGoMailObject+ActiveSync.m b/ActiveSync/SOGoMailObject+ActiveSync.m
index e7a5ce540..1d6bd02ac 100644
--- a/ActiveSync/SOGoMailObject+ActiveSync.m
+++ b/ActiveSync/SOGoMailObject+ActiveSync.m
@@ -772,7 +772,8 @@ struct GlobalObjectId {
             }
         }
 
-      return [theContent substringToIndex: i];
+      if (i >= 0)
+        return [theContent substringToIndex: i];
     }
 
   *wasTruncated = 0;