diff --git a/source/code/TextManager.hpp b/source/code/TextManager.hpp
index 67c5051..a489476 100644
--- a/source/code/TextManager.hpp
+++ b/source/code/TextManager.hpp
@@ -17,7 +17,7 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see http://www.gnu.org/licenses/
 
 Source information and contacts persons can be found at
-http://www.blockattack.net
+https://blockattack.net
 ===========================================================================
 */
 
@@ -31,7 +31,7 @@ class TextMessage {
 private:
 	int x = 0;
 	int y = 0;
-	unsigned int textt;
+	unsigned int textt = 0;
 	unsigned long int time = 0;
 	unsigned long int placeTime = 0; //Then the text was placed
 public:
diff --git a/source/code/sago/SagoDataHolder.hpp b/source/code/sago/SagoDataHolder.hpp
index 068650a..3c126aa 100644
--- a/source/code/sago/SagoDataHolder.hpp
+++ b/source/code/sago/SagoDataHolder.hpp
@@ -49,7 +49,7 @@ private:
 };
 
 
-class MusicHandler {
+class MusicHandler final {
 public:
 	MusicHandler() {};
 	MusicHandler(const SagoDataHolder* holder, const std::string &musicName);
@@ -62,7 +62,7 @@ private:
 };
 
 
-class SoundHandler {
+class SoundHandler final {
 public:
 	SoundHandler() {};
 	SoundHandler(const SagoDataHolder* holder, const std::string &soundName);
@@ -74,7 +74,7 @@ private:
 	Uint64 version = 0;
 };
 
-class SagoDataHolder {
+class SagoDataHolder final {
 public:
 	/**
 	 * The renderer must be set before requesting a texture.
@@ -112,7 +112,7 @@ public:
 	 * @return A globally unique number.
 	 */
 	Uint64 getVersion() const;
-	virtual ~SagoDataHolder();
+	~SagoDataHolder();
 private:
 	SagoDataHolder(const SagoDataHolder& base) = delete;
 	SagoDataHolder& operator=(const SagoDataHolder& base) = delete;
diff --git a/source/code/sago/SagoSprite.hpp b/source/code/sago/SagoSprite.hpp
index c66fd87..688770a 100644
--- a/source/code/sago/SagoSprite.hpp
+++ b/source/code/sago/SagoSprite.hpp
@@ -29,7 +29,7 @@ SOFTWARE.
 
 namespace sago {
 
-class SagoSprite {
+class SagoSprite final {
 public:
 	SagoSprite();
 	SagoSprite(const SagoDataHolder &texHolder, const std::string &texture,const SDL_Rect& initImage,const int animationFrames, const int animationFrameLength);
@@ -76,7 +76,7 @@ public:
 	SagoSprite& operator=(const SagoSprite& base);
 	int GetWidth() const;
 	int GetHeight() const;
-	virtual ~SagoSprite();
+	~SagoSprite();
 private:
 	struct SagoSpriteData;
 	SagoSpriteData *data;
diff --git a/source/code/sago/SagoSpriteHolder.hpp b/source/code/sago/SagoSpriteHolder.hpp
index 7e2924c..21b093e 100644
--- a/source/code/sago/SagoSpriteHolder.hpp
+++ b/source/code/sago/SagoSpriteHolder.hpp
@@ -30,10 +30,10 @@ SOFTWARE.
 
 namespace sago {
 
-class SagoSpriteHolder {
+class SagoSpriteHolder final {
 public:
 	explicit SagoSpriteHolder(const SagoDataHolder &texHolder);
-	virtual ~SagoSpriteHolder();
+	~SagoSpriteHolder();
 	void ReadSprites();
 	const sago::SagoSprite& GetSprite(const std::string &spritename) const;
 	const SagoDataHolder& GetDataHolder() const;
diff --git a/source/code/sago/SagoTextBox.hpp b/source/code/sago/SagoTextBox.hpp
index 5aeae4c..906fae2 100644
--- a/source/code/sago/SagoTextBox.hpp
+++ b/source/code/sago/SagoTextBox.hpp
@@ -30,10 +30,10 @@ SOFTWARE.
 
 namespace sago {
 
-class SagoTextBox {
+class SagoTextBox final {
 public:
 	SagoTextBox();
-	virtual ~SagoTextBox();
+	~SagoTextBox();
 	void SetHolder(const SagoDataHolder* holder);
 	void SetText(const char* text);
 	void SetText(const std::string& text);
diff --git a/source/code/sago/SagoTextField.hpp b/source/code/sago/SagoTextField.hpp
index ad24dc1..f3af800 100644
--- a/source/code/sago/SagoTextField.hpp
+++ b/source/code/sago/SagoTextField.hpp
@@ -38,13 +38,13 @@ namespace sago {
  * Normally all values will be set at the beginning before text is drawn.
  * SetHolder MUST be called before the field is drawn!
  */
-class SagoTextField {
+class SagoTextField final {
 public:
 	SagoTextField();
 	SagoTextField(SagoTextField&& o) noexcept;
 	SagoTextField& operator=(const SagoTextField&& base) = delete;
 	SagoTextField& operator=(const SagoTextField& base) = delete;
-	virtual ~SagoTextField();
+	~SagoTextField();
 	/**
 	 * This method creates a copy of a given font.
 	 * The cache will not be copied.