diff -r 3578977d29a3 -r f48cea237ec3 src/server/daemon/auth.c
--- a/src/server/daemon/auth.c	Tue Jun 25 22:18:59 2013 +0200
+++ b/src/server/daemon/auth.c	Wed Jun 26 15:09:54 2013 +0200
@@ -137,7 +137,7 @@
     
     cusr->authdb = strdup(authdb);
     cusr->password = strdup(password);
-    cusr->groups = calloc(numgroups, sizeof(sstr_t));
+    cusr->groups = numgroups ? calloc(numgroups, sizeof(sstr_t)) : NULL;
     cusr->numgroups = numgroups;
     for(int i=0;i<numgroups;i++) {
         cusr->groups[i] = sstrdup(sstr(groups[i]));