diff --git a/test-fusion.js b/test-fusion.js
index 19cc104..ab1adb0 100644
--- a/test-fusion.js
+++ b/test-fusion.js
@@ -11,7 +11,7 @@ function fuseEpisodeResults(semanticEps, keywordEps, { semanticWeight, keywordWe
         const contrib = keywordWeight / (k + i + 1);
         if (scores.has(ep.id)) {
             scores.get(ep.id).score += contrib;
-        } else {
+        } else if (contrib > 0) {
             scores.set(ep.id, { episode: ep, score: contrib });
         }
     });