diff --git a/modules/upgrade_dist.sh b/modules/upgrade_dist.sh
index 81eb454..9dbc25e 100644
--- a/modules/upgrade_dist.sh
+++ b/modules/upgrade_dist.sh
@@ -105,6 +105,7 @@ precheck_upgrade_dist()
     file_must_exists pkgman/${SYS_DIST}_${SYS_VER}.list
     if [[ -z $NO_MAIN_SOURCE ]]; then
         prnt E "A required variable to configure apt is not defined."
+        die 160
     fi
 }