From bdd967abdcbb999f1be1cfbf795dac60004f99ff Mon Sep 17 00:00:00 2001
From: Jarno Elovirta <jarno@elovirta.com>
Date: Mon, 25 Mar 2024 12:32:41 +0200
Subject: [PATCH] Handle NPE when filter is not run by returning empty Set

Signed-off-by: Jarno Elovirta <jarno@elovirta.com>
---
 src/main/java/org/dita/dost/writer/KeyrefPaser.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main/java/org/dita/dost/writer/KeyrefPaser.java b/src/main/java/org/dita/dost/writer/KeyrefPaser.java
index d70acdf388..8decaca8a4 100644
--- a/src/main/java/org/dita/dost/writer/KeyrefPaser.java
+++ b/src/main/java/org/dita/dost/writer/KeyrefPaser.java
@@ -211,6 +211,9 @@ public void setKeyDefinition(final KeyScope definitionMap) {
    * Get set of link targets which have normal processing role. Paths are relative to current file.
    */
   public Set<URI> getNormalProcessingRoleTargets() {
+    if (normalProcessingRoleTargets == null) {
+      return Set.of();
+    }
     return Collections.unmodifiableSet(normalProcessingRoleTargets);
   }