diff --git a/src/lib/jobs/kjob.cpp b/src/lib/jobs/kjob.cpp
--- a/src/lib/jobs/kjob.cpp
+++ b/src/lib/jobs/kjob.cpp
@@ -96,6 +96,13 @@
 void KJob::finishJob(bool emitResult)
 {
     Q_D(KJob);
+
+    // Avoid finishing what is already finished
+    Q_ASSERT(!d->isFinished); // To detect the origin of the double finish
+    if (d->isFinished) {
+        return;
+    }
+
     d->isFinished = true;
 
     if (d->eventLoop) {