diff --git a/CHANGELOG b/CHANGELOG
index bca35cb..960ebaa 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -27,6 +27,7 @@ Ver.1.2.0:
 * [lib] rewrited getSettingsFromProfile() function
 * [plasmoid] edited configuration interface
 * [plasmoid] changed double click event to click event
+- [gui] fix possible segfaults with null arrays (#5)
 
 Ver.1.1.0 (netctl-1.7 update):
 + [gui] added frequency
diff --git a/PKGBUILD b/PKGBUILD
index 599742e..526e184 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -15,7 +15,7 @@ optdepends=('kdebase-runtime: sudo support'
             'wpa_supplicant: wifi support')
 source=("https://github.com/arcan1s/netctl-gui/releases/download/V.${pkgver}/${pkgbase}-${pkgver}-src.tar.xz")
 install="${pkgbase}.install"
-md5sums=('82954cf5531f0c94854b76eb463ed981')
+md5sums=('e6ad580c9f7fcd593480f14cd93c471c')
 
 prepare() {
   rm -rf "${srcdir}/"{build-plasmoid,build-qt4,build-qt5}
diff --git a/sources/gui/src/language.cpp b/sources/gui/src/language.cpp
index 4a3f069..9c8d7c4 100644
--- a/sources/gui/src/language.cpp
+++ b/sources/gui/src/language.cpp
@@ -69,7 +69,9 @@ QString Language::defineLanguageFromFile(const QString configPath)
         return language;
     while (true) {
         fileStr = QString(configFile.readLine());
+        if (fileStr.isEmpty()) continue;
         if (fileStr[0] == QChar('#')) continue;
+        if (fileStr[0] == QChar(';')) continue;
         if (fileStr.contains(QString("LANGUAGE=")))
             language = fileStr.split(QChar('='))[1]
                     .remove(QChar(' '))
diff --git a/sources/gui/src/mainwindow.cpp b/sources/gui/src/mainwindow.cpp
index fbee361..0743473 100644
--- a/sources/gui/src/mainwindow.cpp
+++ b/sources/gui/src/mainwindow.cpp
@@ -231,7 +231,6 @@ void MainWindow::createActions()
     connect(ui->tabWidget, SIGNAL(currentChanged(int)), this, SLOT(updateTabs(int)));
     connect(ui->actionAbout, SIGNAL(triggered(bool)), aboutWin, SLOT(show()));
     connect(ui->actionNetctlAuto, SIGNAL(triggered(bool)), netctlAutoWin, SLOT(showWindow()));
-    ui->actionNetctlAuto->setVisible(checkExternalApps(QString("all")));
     connect(ui->actionSettings, SIGNAL(triggered(bool)), settingsWin, SLOT(showWindow()));
     connect(ui->actionQuit, SIGNAL(triggered(bool)), this, SLOT(close()));
 
diff --git a/sources/gui/src/settingswindow.cpp b/sources/gui/src/settingswindow.cpp
index e567269..f3438d1 100644
--- a/sources/gui/src/settingswindow.cpp
+++ b/sources/gui/src/settingswindow.cpp
@@ -358,6 +358,7 @@ QMap<QString, QString> SettingsWindow::getSettings()
         return settings;
     while (true) {
         fileStr = QString(configFile.readLine()).trimmed();
+        if (fileStr.isEmpty()) continue;
         if (fileStr[0] == QChar('#')) continue;
         if (fileStr[0] == QChar(';')) continue;
         if (!fileStr.contains(QChar('='))) continue;
diff --git a/sources/netctlgui/src/netctlinteract.cpp b/sources/netctlgui/src/netctlinteract.cpp
index 731f9ff..6b5594c 100644
--- a/sources/netctlgui/src/netctlinteract.cpp
+++ b/sources/netctlgui/src/netctlinteract.cpp
@@ -126,9 +126,9 @@ QString Netctl::getNetctlOutput(const bool sudo, const QString commandLine, cons
  */
 QString Netctl::getWifiInterface()
 {
-    if (debug) qDebug() << "[Netctl]" << "[getInterfaceList]";
+    if (debug) qDebug() << "[Netctl]" << "[getWifiInterface]";
     if (ifaceDirectory == 0) {
-        if (debug) qDebug() << "[Netctl]" << "[getInterfaceList]" << ":" << "Could not find directory";
+        if (debug) qDebug() << "[Netctl]" << "[getWifiInterface]" << ":" << "Could not find directory";
         return QString();
     }
 
@@ -137,14 +137,17 @@ QString Netctl::getWifiInterface()
         interfaces.append(mainInterface);
     QStringList allInterfaces = ifaceDirectory->entryList(QDir::Dirs | QDir::NoDotAndDotDot);
     for (int i=0; i<allInterfaces.count(); i++) {
-        if (debug) qDebug() << "[Netctl]" << "[getInterfaceList]" << ":" << "Check directory"
+        if (debug) qDebug() << "[Netctl]" << "[getWifiInterface]" << ":" << "Check directory"
                  << ifaceDirectory->path() + QDir::separator() + allInterfaces[i] + QDir::separator() + QString("wireless");
         if (QDir(ifaceDirectory->path() + QDir::separator() + allInterfaces[i] +
                  QDir::separator() + QString("wireless")).exists())
             interfaces.append(allInterfaces[i]);
     }
 
-    return interfaces[0];
+    if (interfaces.count() == 0)
+        return QString("");
+    else
+        return interfaces[0];
 }
 
 
@@ -244,6 +247,8 @@ bool Netctl::systemctlCall(const bool sudo, const QString commandLine)
     QProcess command;
     QString commandText;
     QString interface = getWifiInterface();
+    if (interface.isEmpty())
+        return false;
     if (sudo)
         commandText = sudoCommand + QString(" ") + systemctlCommand + QString(" ") + commandLine +
                 QString(" ") + netctlAutoService + QString("@") + interface + QString(".service");
@@ -341,6 +346,7 @@ QString Netctl::getProfileDescription(const QString profile)
         return description;
     while (true) {
         fileStr = QString(profileFile.readLine());
+        if (fileStr.isEmpty()) continue;
         if (fileStr[0] == QChar('#')) continue;
         if (fileStr.split(QChar('='), QString::SkipEmptyParts).count() == 2)
             if (fileStr.split(QChar('='), QString::SkipEmptyParts)[0] == QString("Description"))
@@ -465,6 +471,7 @@ QString Netctl::getSsidFromProfile(const QString profile)
         return ssidName;
     while (true) {
         fileStr = QString(profileFile.readLine());
+        if (fileStr.isEmpty()) continue;
         if (fileStr[0] == QChar('#')) continue;
         if (fileStr.split(QChar('='), QString::SkipEmptyParts).count() == 2)
             if (fileStr.split(QChar('='), QString::SkipEmptyParts)[0] == QString("ESSID"))
diff --git a/sources/netctlgui/src/wpasupinteract.cpp b/sources/netctlgui/src/wpasupinteract.cpp
index 60642e6..f579aa7 100644
--- a/sources/netctlgui/src/wpasupinteract.cpp
+++ b/sources/netctlgui/src/wpasupinteract.cpp
@@ -287,6 +287,10 @@ bool WpaSup::startWpaSupplicant()
         if (debug) qDebug() << "[WpaSup]" << "[startWpaSupplicant]" << ":" << "Could not find wpa_supplicant";
         return false;
     }
+    if (getInterfaceList().count() == 0) {
+        if (debug) qDebug() << "[WpaSup]" << "[startWpaSupplicant]" << ":" << "Could not find interfaces";
+        return false;
+    }
 
     if (QFile(pidFile).exists())
         return true;
@@ -339,6 +343,10 @@ QString WpaSup::getWpaCliOutput(const QString commandLine)
         if (debug) qDebug() << "[WpaSup]" << "[getWpaCliOutput]" << ":" << "Could not find wpa_cli";
         return QString();
     }
+    if (getInterfaceList().count() == 0) {
+        if (debug) qDebug() << "[WpaSup]" << "[getWpaCliOutput]" << ":" << "Could not find interfaces";
+        return QString();
+    }
 
     QProcess command;
     QString interface = getInterfaceList()[0];
@@ -371,6 +379,10 @@ bool WpaSup::wpaCliCall(const QString commandLine)
         if (debug) qDebug() << "[WpaSup]" << "[wpaCliCall]" << ":" << "Could not find wpa_cli";
         return false;
     }
+    if (getInterfaceList().count() == 0) {
+        if (debug) qDebug() << "[WpaSup]" << "[wpaCliCall]" << ":" << "Could not find interfaces";
+        return QString();
+    }
 
     QProcess command;
     QString interface = getInterfaceList()[0];