diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/Preferences.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/Preferences.java
index 790f0e845..f2f308d65 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/Preferences.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/Preferences.java
@@ -535,6 +535,9 @@ public class Preferences {
 
     private void replaceDefaultKeyserverWithUbuntu() {
         ArrayList<HkpKeyserverAddress> servers = getKeyServers();
+        if (servers.isEmpty()) {
+            return;
+        }
         boolean oldDefaults = "hkps://hkps.pool.sks-keyservers.net".equalsIgnoreCase(servers.get(0).getUrl()) ||
                 "hkps://pgp.mit.edu".equalsIgnoreCase(servers.get(0).getUrl());