From 7198cee85e19f020e8e517b4d7f0f60f2bff88f8 Mon Sep 17 00:00:00 2001
From: Nicolas Werner <nicolas.werner@hotmail.de>
Date: Fri, 1 Jul 2022 09:14:17 +0200
Subject: [PATCH] Fix crash on empty user cache stored

---
 src/Cache.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/Cache.cpp b/src/Cache.cpp
index 67889543..c9baaf5e 100644
--- a/src/Cache.cpp
+++ b/src/Cache.cpp
@@ -4442,11 +4442,15 @@ Cache::markUserKeysOutOfDate(lmdb::txn &txn,
 
         std::string_view oldKeys;
 
-        UserKeyCache cacheEntry;
+        UserKeyCache cacheEntry{};
         auto res = db.get(txn, user, oldKeys);
         if (res) {
-            cacheEntry = nlohmann::json::parse(std::string_view(oldKeys.data(), oldKeys.size()))
-                           .get<UserKeyCache>();
+            try {
+                cacheEntry = nlohmann::json::parse(std::string_view(oldKeys.data(), oldKeys.size()))
+                               .get<UserKeyCache>();
+            } catch (std::exception &e) {
+                nhlog::db()->error("Failed to parse {}: {}", oldKeys, e.what());
+            }
         }
         cacheEntry.last_changed = sync_token;