Check for NULL strings before getting their lengths

Problem reported by Karsten Trulsen

Signed-off-by: Matthieu Herrb <matthieu@herrb.eu>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/Font.c b/src/Font.c
index 1cd89cca..d4314e26 100644
--- a/src/Font.c
+++ b/src/Font.c
@@ -102,7 +102,7 @@ XFontStruct *XLoadQueryFont(
     XF86BigfontCodes *extcodes = _XF86BigfontCodes(dpy);
 #endif
 
-    if (strlen(name) >= USHRT_MAX)
+    if (name != NULL && strlen(name) >= USHRT_MAX)
         return NULL;
     if (_XF86LoadQueryLocaleFont(dpy, name, &font_result, (Font *)0))
       return font_result;