diff --git a/include/config.h b/include/config.h
index 7f263da0..b05e4387 100644
--- a/include/config.h
+++ b/include/config.h
@@ -155,8 +155,8 @@ protected:
     virtual void setUnreadKeys() override {};
 
 private:
-    QString stringFromByteArray(QByteArray);
-    QByteArray bytesFromString(QString);
+    QString stringFromByteArray(const QByteArray&);
+    QByteArray bytesFromString(const QString&);
 
     QStringList recentProjects;
     QByteArray mainWindowGeometry;
diff --git a/src/config.cpp b/src/config.cpp
index b22972a4..c4221d30 100644
--- a/src/config.cpp
+++ b/src/config.cpp
@@ -496,18 +496,18 @@ QMap<QString, QString> PorymapConfig::getKeyValueMap() {
     return map;
 }
 
-QString PorymapConfig::stringFromByteArray(QByteArray bytearray) {
+QString PorymapConfig::stringFromByteArray(const QByteArray &bytearray) {
     QString ret;
-    for (auto ch : bytearray) {
+    for (const auto &ch : bytearray) {
         ret += QString::number(static_cast<int>(ch)) + ":";
     }
     return ret;
 }
 
-QByteArray PorymapConfig::bytesFromString(QString in) {
+QByteArray PorymapConfig::bytesFromString(const QString &in) {
     QByteArray ba;
-    QStringList split = in.split(":");
-    for (auto ch : split) {
+    QStringList split = in.split(":", Qt::SkipEmptyParts);
+    for (const auto &ch : split) {
         ba.append(static_cast<char>(ch.toInt()));
     }
     return ba;