diff --git a/src/core/operations/Jsonata.mjs b/src/core/operations/Jsonata.mjs
index 1651e093..82cc4d39 100644
--- a/src/core/operations/Jsonata.mjs
+++ b/src/core/operations/Jsonata.mjs
@@ -58,7 +58,7 @@ class JsonataQuery extends Operation {
             );
         }
 
-        return JSON.stringify(result);
+        return JSON.stringify(result === undefined ? "" : result);
     }
 }