Proposed fix: Index: ccache/ccbase.c =================================================================== --- ccache/ccbase.c (revision 22114) +++ ccache/ccbase.c (working copy) @@ -181,7 +181,7 @@ const krb5_cc_ops *ops; pfx = NULL; - cp = strchr (name, ':'); + cp = name ? strchr (name, ':') : NULL; if (!cp) { if (krb5_cc_dfl_ops) return (*krb5_cc_dfl_ops->resolve)(context, cache, name);