From 9d07bb5d727ab5af64b764d1b484dde476f9a15f Mon Sep 17 00:00:00 2001
From: Philipp Crocoll <philipp@crocoll.net>
Date: Tue, 9 May 2017 06:35:57 +0200
Subject: [PATCH] fix crash when trying to enable fingerprint without password.
 (that doesn't mean it's now useful to do so)

---
 src/keepass2android/FingerprintSetupActivity.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/keepass2android/FingerprintSetupActivity.cs b/src/keepass2android/FingerprintSetupActivity.cs
index 19df56de..1a8d3b1e 100644
--- a/src/keepass2android/FingerprintSetupActivity.cs
+++ b/src/keepass2android/FingerprintSetupActivity.cs
@@ -187,7 +187,10 @@ namespace keepass2android
 			else
 			{
 				if (_unlockMode == FingerprintUnlockMode.FullUnlock)
-					_enc.StoreEncrypted(App.Kp2a.GetDb().KpDatabase.MasterKey.GetUserKey<KcpPassword>().Password.ReadString(), CurrentPreferenceKey, edit);
+				{
+					var userKey = App.Kp2a.GetDb().KpDatabase.MasterKey.GetUserKey<KcpPassword>();
+					_enc.StoreEncrypted(userKey != null ? userKey.Password.ReadString() : "", CurrentPreferenceKey, edit);
+				}
 				else
 					_enc.StoreEncrypted("QuickUnlock" /*some dummy data*/, CurrentPreferenceKey, edit);
 			}