default value 0 for `RESTART_ALWAYS`
@@ -62,7 +62,7 @@ if [ $BG_MODE -eq 1 ]; then
ADDITIONAL_ARGS="$ADDITIONAL_ARGS -d"
fi
-if [ $RESTART_ALWAYS -eq 1 ]; then
+if [ ${RESTART_ALWAYS:-0} -eq 1 ]; then
COMPOSE_FILES="$COMPOSE_FILES -f $COMPOSE_DIR/restart-always.yml"
fi
