diff --git a/container-search/src/test/java/com/yahoo/search/searchers/RelatedDocumentsByNearestNeighborSearcherTestCase.java b/container-search/src/test/java/com/yahoo/search/searchers/RelatedDocumentsByNearestNeighborSearcherTestCase.java
index dd330ec97cbc..05f450a1aca4 100644
--- a/container-search/src/test/java/com/yahoo/search/searchers/RelatedDocumentsByNearestNeighborSearcherTestCase.java
+++ b/container-search/src/test/java/com/yahoo/search/searchers/RelatedDocumentsByNearestNeighborSearcherTestCase.java
@@ -68,6 +68,23 @@ void testDocumentNotFoundReturnsError() {
                 "Error message was: " + result.hits().getError().getDetailedMessage());
     }
 
+    @Test
+    void testNonTensorEmbeddingFieldReturnsError() {
+        var searcher = new RelatedDocumentsByNearestNeighborSearcher();
+        var query = new Query("?relatedTo.id=doc1&relatedTo.embeddingField=embedding&relatedTo.queryTensorName=q");
+
+        var sourceHit = new Hit("source");
+        sourceHit.setField("embedding", "not a tensor"); // Field exists but is not a Tensor
+
+        var capturedQuery = new Query[1];
+        var result = executeWithCapture(searcher, query, sourceHit, capturedQuery);
+
+        assertNotNull(result.hits().getError(), "Expected error but got none");
+        String errorMsg = result.hits().getError().getDetailedMessage();
+        assertTrue(errorMsg.contains("Could not find document") && errorMsg.contains("has no embedding"),
+                "Error message was: " + errorMsg);
+    }
+
     @Test
     void testNearestNeighborQueryIsCreated() {
         var searcher = new RelatedDocumentsByNearestNeighborSearcher();