Add additional check for invalid megolm sessions

1 files changed, 4 insertions, 0 deletions

diff --git a/src/Olm.cpp b/src/Olm.cpp

index 60460b5c..14c97984 100644
--- a/src/Olm.cpp
+++ b/src/Olm.cpp
@@ -1129,6 +1129,10 @@ decryptEvent(const MegolmSessionIndex &index,
     std::string msg_str;
     try {
         auto session = cache::client()->getInboundMegolmSession(index);
+        if (!session) {
+            return {DecryptionErrorCode::MissingSession, std::nullopt, std::nullopt};
+        }
+
         auto sessionData =
           cache::client()->getMegolmSessionData(index).value_or(GroupSessionData{});