crash fix

diff --git a/dwm.c b/dwm.c
index ec37588..f5aa010 100644 (file)
--- a/dwm.c
+++ b/dwm.c
@@ -1478,7 +1478,7 @@ togglefloating(const Arg *arg) {
 
 void
 togglelayout(const Arg *arg) {
-       if(arg->v)
+       if(arg && arg->v)
                lt = (Layout *)arg->v;
        else if(++lt == &layouts[LENGTH(layouts)])
                lt = &layouts[0];