[plasma/libkscreen] src: Add null check for backend in SetConfigOperation::start()

Git commit 8a7b2988839ed86d778d0d4fe37b1376ef1ba13a by zhang shoucheng.
Committed on 04/08/2026 at 03:30.
Pushed by vladz into branch 'master'.

Add null check for backend in SetConfigOperation::start()

M  +3    -0    src/setconfigoperation.cpp

https://invent.kde.org/plasma/libkscreen/-/commit/8a7b2988839ed86d778d0d4fe37b1376ef1ba13a

diff --git a/src/setconfigoperation.cpp b/src/setconfigoperation.cpp
index cab0028b..7c115cdd 100644
--- a/src/setconfigoperation.cpp
+++ b/src/setconfigoperation.cpp
@@ -65,6 +65,9 @@ void SetConfigOperation::start()
     Q_D(SetConfigOperation);
     d->fixPriorities();
     auto backend = d->loadBackend();
+    if (!backend) {
+        return; // loadBackend() already set error and called emitResult() for us
+    }
     QFutureWatcher<SetConfigResult> *watcher = new QFutureWatcher<SetConfigResult>(this);
     connect(watcher, &QFutureWatcher<SetConfigResult>::finished, this, [this, watcher]() {
         watcher->deleteLater();