diff --git a/.gitignore b/.gitignore
index 7bbf0cf..cc9ac0f 100755
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 *.*~
+*.vim
 *.SET
 *.ods#
 *.aux
diff --git a/ahilbig-presentation.sty b/ahilbig-presentation.sty
index 0a922c6..c112894 100644
--- a/ahilbig-presentation.sty
+++ b/ahilbig-presentation.sty
@@ -797,11 +797,13 @@
     {\usebeamercolor[fg]{info in title}\lecturename} \hbox{\translate{vom}
       \insertdate}%
       \vfill
+			\ifthenelse{\equal{\inserturl}{null}}{}{%
       \begin{tiny}
        %\versionsinfo
 							Quellen: \url{\inserturl}
       \end{tiny}
       \vfill
+			}
       \ifcd\hbox{\translate{ von}
       {\usebeamercolor[fg]{info in title}\insertauthor}}\fi}\par
   \ifcd\else\vskip6em