typo

src/scripts/restartservice.sh

@@ -38,7 +38,7 @@ elif [[ "${service}" == "box" ]]; then
     readonly ubuntu_version=$(lsb_release -rs)
     if [[ "${ubuntu_version}" == "18.04" ]]; then
         pid=$(systemctl show box -p MainPID | sed 's/MainPID=//g')
-        kill -HUP $MAINPID
+        kill -HUP $pid
     else
         systemctl reload --no-block box
     fi