diff --git a/src/gui/widget/textbox.cpp b/src/gui/widget/textbox.cpp
index bf812c9ce..1be1919cf 100644
--- a/src/gui/widget/textbox.cpp
+++ b/src/gui/widget/textbox.cpp
@@ -707,7 +707,8 @@ void CTextBox::refreshText(void)
 		//calculate xpos
 		if ((m_nMode & CENTER) || (m_nMode & RIGHT))
 		{
-			x_center = m_cFrameTextRel.iWidth - m_cFrameTextRel.iX - 2*text_Hborder_width - m_pcFontText->getRenderWidth(m_cLineArray[i], m_utf8_encoded);
+			std::string tmpline = !m_cLineArray.empty() ? m_cLineArray[i] : "";
+			x_center = m_cFrameTextRel.iWidth - m_cFrameTextRel.iX - 2*text_Hborder_width - m_pcFontText->getRenderWidth(tmpline, m_utf8_encoded);
 			if (m_nMode & CENTER)
 				x_center /= 2;
 			if (m_nMode & SCROLL)
@@ -947,7 +948,7 @@ void CTextBox::disableBackgroundPaint()
 	enableBackgroundPaint(false);
 }
 
-void CTextBox::setTextRenderModeFullBG(bool mode)
+void CTextBox::setTextRenderModeFullBG(const bool& mode)
 {
 	m_renderMode = (mode) ? 2 /*Font::FULLBG*/ : 0;
 }
diff --git a/src/gui/widget/textbox.h b/src/gui/widget/textbox.h
index c9b69e2e3..63f06f9da 100644
--- a/src/gui/widget/textbox.h
+++ b/src/gui/widget/textbox.h
@@ -191,7 +191,7 @@ class CTextBox : public sigc::trackable
 		void    setTextBorderWidth(int Hborder, int Vborder);
 		void	setTextFont(Font* font_text);
 		void	setTextMode(const int text_mode){m_nMode = text_mode;};
-		void	setTextRenderModeFullBG(bool mode);
+		void	setTextRenderModeFullBG(const bool& mode);
 		void	setBackGroundColor(CFBWindow::color_t textBackgroundColor){m_textBackgroundColor = textBackgroundColor;};
 		void	setWindowPos(const CBox* position){m_cFrame = *position;};
 		void 	setWindowMaxDimensions(const int width, const int height);