diff --git a/.travis.yml b/.travis.yml
index 5ed6b432..49d546f4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,10 +15,11 @@ cache:
     - $HOME/.gradle/caches/
     - $HOME/.gradle/wrapper/
 
+before_deploy: tar -zcf variED-${TRAVIS_TAG}.tar.gz -C build .
+
 deploy:
   - provider: releases
-    file_glob: true
-    file: build/**/*
+    file: variED-${TRAVIS_TAG}.tar.gz
     skip_cleanup: true
     on:
       repo: ekuiter/variED
diff --git a/client/src/server/FeatureModel.js b/client/src/server/FeatureModel.js
index 08aec760..b84bb4b7 100644
--- a/client/src/server/FeatureModel.js
+++ b/client/src/server/FeatureModel.js
@@ -57,7 +57,10 @@ export default class FeatureModel {
     }
 
     isSiblingFeatures(featureNames) {
-        const parents = featureNames.map(this.getNode.bind(this)).map(node => node.parent);
+        const parents = featureNames
+            .map(this.getNode.bind(this))
+            .filter(node => node)
+            .map(node => node.parent);
         return parents.every(parent => parent === parents[0]);
     }
 };
\ No newline at end of file