diff --git a/landingPages/landing-utils/parsingFunctions.class.ts b/landingPages/landing-utils/parsingFunctions.class.ts
index 799f71db..26c1f9d0 100644
--- a/landingPages/landing-utils/parsingFunctions.class.ts
+++ b/landingPages/landing-utils/parsingFunctions.class.ts
@@ -664,7 +664,7 @@ export class ParsingFunctions {
       }
     }
 
-    if(properties.environment != "production") {
+    if(properties.environment != "production" && classifiedSubjects != null) {
       for (let classified of classifiedSubjects.keys()) {
         subjects = subjects.concat(classifiedSubjects.get(classified));
       }