Why the service which uses daemon function from `/etc/init.d/function` throws failure from switching from root to any other user ?

Issue

• The service which uses daemon function from /etc/init.d/function throws failure from switching from root to any other user ?

    226         # And start it up.
    227         if [ -z "$user" ]; then
    228            $nice /bin/bash -c "$corelimit >/dev/null 2>&1 ; $*"
    229         else
    230            $nice runuser -s /bin/bash - $user -c "$corelimit >/dev/n        ull 2>&1 ; $*"