diff --git a/lib/domain-discovery.sh b/lib/domain-discovery.sh
index 6541408..9b47b7f 100644
--- a/lib/domain-discovery.sh
+++ b/lib/domain-discovery.sh
@@ -13,7 +13,14 @@ if [ -z "$TOOLKIT_BASE_DIR" ]; then
 fi
 
 # Source control panel helpers if available
-[ "$SYS_CONTROL_PANEL" = "plesk" ] && [ -f "$LIB_DIR/plesk-helpers.sh" ] && source "$LIB_DIR/plesk-helpers.sh"
+if [ "$SYS_CONTROL_PANEL" = "plesk" ]; then
+    # Try LIB_DIR first, then SCRIPT_DIR
+    if [ -n "$LIB_DIR" ] && [ -f "$LIB_DIR/plesk-helpers.sh" ]; then
+        source "$LIB_DIR/plesk-helpers.sh"
+    elif [ -n "$SCRIPT_DIR" ] && [ -f "$SCRIPT_DIR/plesk-helpers.sh" ]; then
+        source "$SCRIPT_DIR/plesk-helpers.sh"
+    fi
+fi
 
 #############################################################################
 # DOMAIN DISCOVERY (Control Panel Agnostic)
@@ -36,7 +43,15 @@ list_all_domains() {
             ;;
 
         plesk)
-            plesk_list_domains
+            # Use plesk_list_domains if available, otherwise fallback
+            if type plesk_list_domains >/dev/null 2>&1; then
+                plesk_list_domains
+            else
+                # Fallback: scan vhosts directory
+                ls -1 /var/www/vhosts/ 2>/dev/null | \
+                    grep -v "^system$\|^chroot$\|^\.skel$\|^default$\|^fs$" | \
+                    grep -v "^\." || true
+            fi
             ;;
 
         interworx)