From df5dd8206b473aeda20f5d7c20c34150631c37cc Mon Sep 17 00:00:00 2001
From: Rich <piemonkey@protonmail.ch>
Date: Thu, 12 Dec 2024 10:22:46 +0100
Subject: [PATCH] Ignore instead of fail when rendering BlankNode with no
 subject

---
 .changeset/witty-moose-mate.md | 5 +++++
 addon/core/schema.ts           | 7 +++++++
 2 files changed, 12 insertions(+)
 create mode 100644 .changeset/witty-moose-mate.md

diff --git a/.changeset/witty-moose-mate.md b/.changeset/witty-moose-mate.md
new file mode 100644
index 000000000..9c1abac4d
--- /dev/null
+++ b/.changeset/witty-moose-mate.md
@@ -0,0 +1,5 @@
+---
+'@lblod/ember-rdfa-editor': patch
+---
+
+If trying to render a BlankNode with no subject, ignore it instead of crashing
diff --git a/addon/core/schema.ts b/addon/core/schema.ts
index 6279a3702..b3fa0479d 100644
--- a/addon/core/schema.ts
+++ b/addon/core/schema.ts
@@ -289,6 +289,13 @@ export function renderInvisibleRdfa(
       case 'BlankNode': {
         // the triple refers to a URI which does not have a corresponding
         // resource node
+        if (!isSome(nodeOrMark.attrs['subject'])) {
+          console.warn(
+            'Trying to render a BlankNode with no subject, ignoring',
+            nodeOrMark.attrs,
+          );
+          break;
+        }
         const subject: string = unwrap(nodeOrMark.attrs['subject'] as string);
         propElements.push(namedNodeSpan(subject, predicate, object.value));
         break;