From 27330ceddc446808310c5fb7edf8f24521a68d22 Mon Sep 17 00:00:00 2001
From: M66B <M66B@users.noreply.github.com>
Date: Wed, 11 May 2022 09:13:47 +0200
Subject: [PATCH] Prevent crash

---
 app/src/main/java/eu/faircode/email/UriHelper.java | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/app/src/main/java/eu/faircode/email/UriHelper.java b/app/src/main/java/eu/faircode/email/UriHelper.java
index 2f3256b320..757a0b59f9 100644
--- a/app/src/main/java/eu/faircode/email/UriHelper.java
+++ b/app/src/main/java/eu/faircode/email/UriHelper.java
@@ -104,7 +104,12 @@ public class UriHelper {
             return null;
         if (tld.equals(host))
             return null;
-        int dot = host.substring(0, host.length() - tld.length() - 1).lastIndexOf('.');
+        int len = host.length() - tld.length() - 1;
+        if (len < 0) {
+            Log.e("getRootDomain host=" + host + " tld=" + tld);
+            return host;
+        }
+        int dot = host.substring(0, len).lastIndexOf('.');
         if (dot < 0)
             return host;
         return host.substring(dot + 1);