diff --git a/gui/checkthread.cpp b/gui/checkthread.cpp
index 26cc2bbc6..551eed382 100644
--- a/gui/checkthread.cpp
+++ b/gui/checkthread.cpp
@@ -313,7 +313,22 @@ void CheckThread::runAddonsAndTools(const ImportProject::FileSettings *fileSetti
                 process.setProcessEnvironment(env);
             }
             process.start(python, args);
-            process.waitForFinished();
+            if (!process.waitForFinished()) {
+                const QString errMsg("ERROR: Process '" + python + " " + args.join(" ") +
+                                     "' did not finish successfully: " + process.errorString());
+                qWarning() << errMsg;
+                mResult.reportOut(errMsg.toStdString());
+            }
+            const QByteArray errout = process.readAllStandardError();
+            if (process.exitCode() != 0 && !errout.isEmpty()) {
+                const QString errMsg("ERROR: Process '" + python + " " + args.join(" ") +
+                                     "' failed with error code " +
+                                     QString::number(process.exitCode()) + ": '" +
+                                     process.errorString() +
+                                     "'\nError output: " + errout);
+                qWarning() << errMsg;
+                mResult.reportOut(errMsg.toStdString());
+            }
             const QString output(process.readAllStandardOutput());
             QFile f(dumpFile + '-' + addon + "-results");
             if (f.open(QIODevice::WriteOnly | QIODevice::Text)) {