From 33ae31f3a426cd5e2594eec900a5bc565dfd41bc Mon Sep 17 00:00:00 2001
From: Joshua Horton <joshua_horton@sil.org>
Date: Thu, 28 Aug 2025 09:32:48 -0500
Subject: [PATCH] fix(web): prevent undefined traversal entry

---
 .../worker-thread/src/main/correction/distance-modeler.ts    | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/web/src/engine/predictive-text/worker-thread/src/main/correction/distance-modeler.ts b/web/src/engine/predictive-text/worker-thread/src/main/correction/distance-modeler.ts
index a7913dc1a9..03b5500d7e 100644
--- a/web/src/engine/predictive-text/worker-thread/src/main/correction/distance-modeler.ts
+++ b/web/src/engine/predictive-text/worker-thread/src/main/correction/distance-modeler.ts
@@ -357,7 +357,10 @@ export class SearchNode {
       node.partialEdge.subsetSubindex++;
       // Append the newly-processed char to the subset's `insert` string.
       node.partialEdge.transformSubset = {...subset, key: startSubset.key, insert: subset.insert + char};
-      node.matchedTraversals.push(childTraversal);
+      // '' inserts do not traverse deeper; do not add an empty traversal entry!
+      if(childTraversal) {
+        node.matchedTraversals.push(childTraversal);
+      }
       nodesToReturn.push(node);
     };