Fix Q_ASSERT failure on sending messages

Changes in e81117fb exposed a flaw in EncryptionEvent causing assertion
failure when this event is default-initialised (i.e. no encryption).

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/room.cpp b/lib/room.cpp
index 7ac3463e..1af294a7 100644
--- a/lib/room.cpp
+++ b/lib/room.cpp
@@ -2580,8 +2580,14 @@ Room::Changes Room::processStateEvent(const RoomEvent& e)
             // clang-format off
         }
         , [this, oldEncEvt = static_cast<const EncryptionEvent*>(oldStateEvent)](
-            const EncryptionEvent&) {
+            const EncryptionEvent& ee) {
             // clang-format on
+            if (ee.algorithm().isEmpty()) {
+                qWarning(STATE)
+                    << "The encryption event for room" << objectName()
+                    << "doesn't have 'algorithm' specified - ignoring";
+                return NoChange;
+            }
             if (oldEncEvt
                 && oldEncEvt->encryption() != EncryptionEventContent::Undefined) {
                 qCWarning(STATE) << "The room is already encrypted but a new"