diff --git a/src/public/javascripts/entities/note_short.js b/src/public/javascripts/entities/note_short.js
index 6a831111b..d5a18bc09 100644
--- a/src/public/javascripts/entities/note_short.js
+++ b/src/public/javascripts/entities/note_short.js
@@ -24,6 +24,10 @@ class NoteShort {
     }
 
     async getChildBranches() {
+        if (!this.treeCache.children) {
+            return [];
+        }
+
         const branches = [];
 
         for (const child of this.treeCache.children[this.noteId]) {
diff --git a/src/public/stylesheets/style.css b/src/public/stylesheets/style.css
index e5719680c..6292e1735 100644
--- a/src/public/stylesheets/style.css
+++ b/src/public/stylesheets/style.css
@@ -298,11 +298,15 @@ div.ui-tooltip {
     font-weight: bold;
     font-size: large;
     padding: 10px;
-    border: 1px solid black;
+    background: #f4f4f4;
     width: 150px;
     height: 95px;
     margin-right: 20px;
-    margin-bottom: 20px;
     border-radius: 15px;
     overflow: hidden;
+    text-align: center;
+}
+
+.child-overview a {
+    color: #444;
 }
\ No newline at end of file