diff --git a/beamerouterthemepolimi.sty b/beamerouterthemepolimi.sty
index e305b57..57a1bba 100644
--- a/beamerouterthemepolimi.sty
+++ b/beamerouterthemepolimi.sty
@@ -5,7 +5,7 @@
 {
     \begin{flushleft}
         \vspace{-0.5cm}
-        {\small \insertsection\ \insertsubsection}~\\
+        {\small \insertsection \ifx\insertsubsection\empty\else\ - \insertsubsection\fi\leavevmode}\\
         \insertframetitle
     \end{flushleft}
 }
diff --git a/demo.pdf b/demo.pdf
index 0e1e8f0..ba829aa 100644
Binary files a/demo.pdf and b/demo.pdf differ