escaped name for computed field undefined

1 files changed, 1 insertions, 1 deletions

diff --git a/src/client/cognitive_services/CognitiveServices.ts b/src/client/cognitive_services/CognitiveServices.ts
index 04a21c837..d4085cf76 100644
--- a/src/client/cognitive_services/CognitiveServices.ts
+++ b/src/client/cognitive_services/CognitiveServices.ts
@@ -110,7 +110,7 @@ export namespace CognitiveServices {
                 let tagDoc = new Doc;
                 results.tags.map((tag: Tag) => {
                     let sanitized = tag.name.replace(" ", "_");
-                    let script = `return (${tag.confidence} >= this.confidence) ? ${tag.confidence} : ${ComputedField.undefined}`;
+                    let script = `return (${tag.confidence} >= this.confidence) ? ${tag.confidence} : "${ComputedField.undefined}"`;
                     let computed = CompileScript(script, { params: { this: "Doc" } });
                     computed.compiled && (tagDoc[sanitized] = new ComputedField(computed));
                 });