diff --git a/scripts/da-integration/alt_mysql_native_backup_restore.sh b/scripts/da-integration/alt_mysql_native_backup_restore.sh
index d131962..c3f126d 100755
--- a/scripts/da-integration/alt_mysql_native_backup_restore.sh
+++ b/scripts/da-integration/alt_mysql_native_backup_restore.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 set -Eeuo pipefail
 
-SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 PLUGIN_DIR="$(cd "$SCRIPT_DIR/../.." && pwd)"
 COMMON_FILE="$PLUGIN_DIR/scripts/setup/mysql_common.sh"
 SETTINGS_FILE="${DA_ALT_MYSQL_SETTINGS_FILE:-$PLUGIN_DIR/plugin-settings.conf}"
@@ -103,10 +103,24 @@ parse_native_db_conf() {
 
   if [ -z "$NATIVE_DB_CHARSET" ]; then
     log "missing db_collation charset in $conf_file"
+    NATIVE_DB_CHARSET=""
+    NATIVE_DB_COLLATION=""
+    NATIVE_DB_USER_NAMES=()
+    NATIVE_DB_USER_HOST=()
+    NATIVE_DB_USER_HASH=()
+    NATIVE_DB_USER_PLUGIN=()
+    NATIVE_DB_USER_PRIVS=()
     return 1
   fi
   if [ "${#NATIVE_DB_USER_NAMES[@]}" -eq 0 ]; then
     log "no MySQL users found in $conf_file"
+    NATIVE_DB_CHARSET=""
+    NATIVE_DB_COLLATION=""
+    NATIVE_DB_USER_NAMES=()
+    NATIVE_DB_USER_HOST=()
+    NATIVE_DB_USER_HASH=()
+    NATIVE_DB_USER_PLUGIN=()
+    NATIVE_DB_USER_PRIVS=()
     return 1
   fi