diff --git a/scripts/install.sh b/scripts/install.sh
index f269a62..06dab33 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -2456,6 +2456,6 @@ main() {
     fi
 }
 
-if [ "${BASH_SOURCE[0]}" = "$0" ]; then
+if [ "${BASH_SOURCE[0]:-$0}" = "$0" ]; then
     main "$@"
 fi
diff --git a/scripts/tests/installer.bats b/scripts/tests/installer.bats
index fed566f..6fe932d 100644
--- a/scripts/tests/installer.bats
+++ b/scripts/tests/installer.bats
@@ -433,3 +433,9 @@ EOF
     "
     [ "$status" -ne 0 ]
 }
+
+@test "запуск через пайп (curl | bash) корректно обрабатывает параметры без ошибки unbound variable" {
+    run bash -c "cat '$SCRIPT' | bash -s -- -h"
+    [ "$status" -eq 0 ]
+    [[ "$output" == *"Free Turn Proxy & AmneziaWG"* ]]
+}