From 20bfd67276147dc1823ff3e34b0408e922120a05 Mon Sep 17 00:00:00 2001
From: Mikhail Podolskiy <mike.podolskiy90@gmail.com>
Date: Thu, 21 Aug 2025 10:54:32 +0200
Subject: [PATCH] Skip null FKs

(cherry picked from commit 2285e7b3c87e3d8b852378f9fcc329d57bd935a3)
---
 .../datapackage/resource/AbstractResource.java                 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main/java/io/frictionlessdata/datapackage/resource/AbstractResource.java b/src/main/java/io/frictionlessdata/datapackage/resource/AbstractResource.java
index dd53e73..a51b5aa 100644
--- a/src/main/java/io/frictionlessdata/datapackage/resource/AbstractResource.java
+++ b/src/main/java/io/frictionlessdata/datapackage/resource/AbstractResource.java
@@ -411,6 +411,9 @@ public void checkRelations(Package pkg) {
                                 Map<String, String> fieldMapping = fk.getForeignKey().getFieldMapping();
                                 String refFieldName = fieldMapping.get(key);
                                 Object fkVal = row.get(key);
+                                if (fkVal == null) {
+                                    continue;
+                                }
                                 boolean found = false;
 
                                 for (Object refRow : refData) {