From 89287c7caeee7e085406f60f99bcc017f60634d8 Mon Sep 17 00:00:00 2001
From: Volker Birk <vb@pep-project.org>
Date: Sun, 28 Jun 2020 15:37:58 +0200
Subject: [PATCH] we have to guarantee this

---
 passphrase_cache.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/passphrase_cache.cc b/passphrase_cache.cc
index 6c71c61..210a94e 100644
--- a/passphrase_cache.cc
+++ b/passphrase_cache.cc
@@ -49,8 +49,10 @@ namespace pEp {
     {
         std::lock_guard<std::mutex> lock(_mtx);
         
-        if (_cache.empty())
+        if (_cache.empty()) {
+            _which = _cache.end();
             throw std::underflow_error("empty passphrase cache");
+        }
 
         if (_which == _cache.begin()) {
             _which = _cache.end();