diff --git a/get_libwallet_api.sh b/get_libwallet_api.sh
index 9b42cfce..96e0ac41 100755
--- a/get_libwallet_api.sh
+++ b/get_libwallet_api.sh
@@ -122,8 +122,8 @@ rm -fr $MONERO_DIR/include
 rm -fr $MONERO_DIR/bin
 
 
-mkdir -p $MONERO_DIR/build/release
-pushd $MONERO_DIR/build/release
+mkdir -p $MONERO_DIR/build/$BUILD_TYPE
+pushd $MONERO_DIR/build/$BUILD_TYPE
 
 # reusing function from "utils.sh"
 platform=$(get_platform)
@@ -209,7 +209,7 @@ if test -z "$CPU_CORE_COUNT"; then
 fi
 
 # Build libwallet_merged
-pushd $MONERO_DIR/build/release/src/wallet
+pushd $MONERO_DIR/build/$BUILD_TYPE/src/wallet
 eval $make_exec version -C ../..
 eval $make_exec  -j$CPU_CORE_COUNT
 eval $make_exec  install -j$CPU_CORE_COUNT
@@ -218,21 +218,21 @@ popd
 # Build monerod
 # win32 need to build daemon manually with msys2 toolchain
 if [ "$platform" != "mingw32" ] && [ "$ANDROID" != true ]; then
-    pushd $MONERO_DIR/build/release/src/daemon
+    pushd $MONERO_DIR/build/$BUILD_TYPE/src/daemon
     eval make  -j$CPU_CORE_COUNT
     eval make install -j$CPU_CORE_COUNT
     popd
 fi
 
 # build install epee
-eval make -C $MONERO_DIR/build/release/contrib/epee all install
+eval make -C $MONERO_DIR/build/$BUILD_TYPE/contrib/epee all install
 
 # install easylogging
-eval make -C $MONERO_DIR/build/release/external/easylogging++ all install
+eval make -C $MONERO_DIR/build/$BUILD_TYPE/external/easylogging++ all install
 
-# Install libunwind
+# Install libunbound
 echo "Installing libunbound..."
-pushd $MONERO_DIR/build/release/external/unbound
+pushd $MONERO_DIR/build/$BUILD_TYPE/external/unbound
 # no need to make, it was already built as dependency for libwallet
 # make -j$CPU_CORE_COUNT
 $make_exec install -j$CPU_CORE_COUNT
diff --git a/main.cpp b/main.cpp
index 08bcb9e3..fba82fec 100644
--- a/main.cpp
+++ b/main.cpp
@@ -255,7 +255,17 @@ int main(int argc, char *argv[])
 
     // Load main window (context properties needs to be defined obove this line)
     engine.load(QUrl(QStringLiteral("qrc:///main.qml")));
+    if (engine.rootObjects().isEmpty())
+    {
+        qCritical() << "Error: no root objects";
+        return 1;
+    }
     QObject *rootObject = engine.rootObjects().first();
+    if (!rootObject)
+    {
+        qCritical() << "Error: no root objects";
+        return 1;
+    }
 
 #ifdef WITH_SCANNER
     QObject *qmlCamera = rootObject->findChild<QObject*>("qrCameraQML");
diff --git a/monero-wallet-gui.pro b/monero-wallet-gui.pro
index de61101f..f064a849 100644
--- a/monero-wallet-gui.pro
+++ b/monero-wallet-gui.pro
@@ -116,6 +116,8 @@ android {
 
 
 
+QMAKE_CXXFLAGS += -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -Wformat -Wformat-security -fstack-protector -fstack-protector-strong
+QMAKE_CFLAGS += -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -Wformat -Wformat-security -fstack-protector -fstack-protector-strong
 
 ios {
     message("Host is IOS")
@@ -236,6 +238,7 @@ win32 {
         message("Target is 64bit")
     }
 
+    QMAKE_LFLAGS += -Wl,--dynamicbase -Wl,--nxcompat
 }
 
 linux {
@@ -276,6 +279,8 @@ linux {
         message(Building with libunwind)
         LIBS += -Wl,-Bdynamic -lunwind
     }
+
+    QMAKE_LFLAGS += -pie -Wl,-z,relro -Wl,-z,now -Wl,-z,noexecstack
 }
 
 macx {
@@ -300,6 +305,7 @@ macx {
         -lcrypto \
         -ldl
 
+    QMAKE_LFLAGS += -pie -Wl,-z,relro -Wl,-z,now -Wl,-z,noexecstack
 }