diff --git a/src/config.cpp b/src/config.cpp
--- a/src/config.cpp
+++ b/src/config.cpp
@@ -367,7 +367,8 @@
 {
     if (config) {
         dbg << "KScreen::Config(";
-        for (const auto output : config->outputs()) {
+        const auto outputs = config->outputs();
+        for (const auto &output : outputs) {
             if (output->isConnected()) {
                 dbg << endl << output;
             }