diff --git a/code/ryzom/tools/client/ryzom_installer/src/configfile.cpp b/code/ryzom/tools/client/ryzom_installer/src/configfile.cpp
index 88fae2388..8815396f7 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/configfile.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/configfile.cpp
@@ -502,6 +502,8 @@ bool CConfigFile::isRyzomInstalledIn(const QString &directory) const
 
 bool CConfigFile::areRyzomDataInstalledIn(const QString &directory) const
 {
+	if (directory.isEmpty()) return false;
+
 	QDir dir(directory);
 
 	// directory doesn't exist
@@ -528,6 +530,8 @@ bool CConfigFile::areRyzomDataInstalledIn(const QString &directory) const
 
 bool CConfigFile::isRyzomClientInstalledIn(const QString &directory) const
 {
+	if (directory.isEmpty()) return false;
+
 	QDir dir(directory);
 
 	// directory doesn't exist
@@ -557,6 +561,8 @@ bool CConfigFile::isRyzomClientInstalledIn(const QString &directory) const
 
 bool CConfigFile::foundTemporaryFiles(const QString &directory) const
 {
+	if (directory.isEmpty()) return false;
+
 	QDir dir(directory);
 
 	// directory doesn't exist
diff --git a/code/ryzom/tools/client/ryzom_installer/src/filescleaner.cpp b/code/ryzom/tools/client/ryzom_installer/src/filescleaner.cpp
index e1481fcf9..79c42634a 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/filescleaner.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/filescleaner.cpp
@@ -52,6 +52,8 @@ void CFilesCleaner::setDirectory(const QString &src)
 
 bool CFilesCleaner::exec()
 {
+	if (m_directory.isEmpty()) return false;
+
 	if (m_listener) m_listener->operationPrepare();
 
 	QDir dir(m_directory);
diff --git a/code/ryzom/tools/client/ryzom_installer/src/utils.cpp b/code/ryzom/tools/client/ryzom_installer/src/utils.cpp
index b07db1e43..5ab73f298 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/utils.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/utils.cpp
@@ -37,23 +37,27 @@ QString qBytesToHumanReadable(qint64 bytes)
 qint64 getDirectorySize(const QString &directory)
 {
 	qint64 size = 0;
-	QDir dir(directory);
 
-	if (dir.exists())
+	if (!directory.isEmpty())
 	{
-		QFileInfoList list = dir.entryInfoList(QDir::Files | QDir::Dirs | QDir::Hidden | QDir::NoSymLinks | QDir::NoDotAndDotDot);
+		QDir dir(directory);
 
-		for (int i = 0; i < list.size(); ++i)
+		if (dir.exists())
 		{
-			QFileInfo fileInfo = list.at(i);
+			QFileInfoList list = dir.entryInfoList(QDir::Files | QDir::Dirs | QDir::Hidden | QDir::NoSymLinks | QDir::NoDotAndDotDot);
 
-			if (fileInfo.isDir())
+			for (int i = 0; i < list.size(); ++i)
 			{
-				size += getDirectorySize(fileInfo.absoluteFilePath());
-			}
-			else
-			{
-				size += fileInfo.size();
+				QFileInfo fileInfo = list.at(i);
+
+				if (fileInfo.isDir())
+				{
+					size += getDirectorySize(fileInfo.absoluteFilePath());
+				}
+				else
+				{
+					size += fileInfo.size();
+				}
 			}
 		}
 	}