diff --git a/app/src/main/java/app/fedilab/android/mastodon/helper/DividerDecoration.java b/app/src/main/java/app/fedilab/android/mastodon/helper/DividerDecoration.java
index 0375fbcc..ca0a42d9 100644
--- a/app/src/main/java/app/fedilab/android/mastodon/helper/DividerDecoration.java
+++ b/app/src/main/java/app/fedilab/android/mastodon/helper/DividerDecoration.java
@@ -118,7 +118,8 @@ public class DividerDecoration extends RecyclerView.ItemDecoration {
 
                         c.drawLine(startPx, view.getTop() - margin, startPx, bottomPx, paint);
                     }
-                    int color = colorList.get(indentation%colorList.size()-1);
+                    int indexColor = indentation%colorList.size();
+                    int color = colorList.get(indexColor > 0 ? indexColor-1:0);
                     paint.setColor(ResourcesCompat.getColor(_mContext.getResources(), color, _mContext.getTheme()));
 
                     float startDp = 6 * fontScale * (indentation - 1) + 6 * fontScale;
diff --git a/app/src/main/java/app/fedilab/android/mastodon/helper/DividerDecorationSimple.java b/app/src/main/java/app/fedilab/android/mastodon/helper/DividerDecorationSimple.java
index 0337fd16..e34f7c31 100644
--- a/app/src/main/java/app/fedilab/android/mastodon/helper/DividerDecorationSimple.java
+++ b/app/src/main/java/app/fedilab/android/mastodon/helper/DividerDecorationSimple.java
@@ -127,7 +127,9 @@ public class DividerDecorationSimple extends RecyclerView.ItemDecoration {
 
                         c.drawLine(startPx, view.getTop() - margin, startPx, bottomPx, paint);
                     }
-                    int color = colorList.get(indentation%colorList.size()-1);
+                    int indexColor = indentation%colorList.size();
+
+                    int color = colorList.get(indexColor > 0 ? indexColor-1:0);
                     paint.setColor(ResourcesCompat.getColor(_mContext.getResources(), color, _mContext.getTheme()));
 
                     float startDp = 6 * fontScale * (indentation - 1) + 6 * fontScale;