diff --git a/src/structs/Item.js b/src/structs/Item.js
index 0b39a246..86cf68e0 100644
--- a/src/structs/Item.js
+++ b/src/structs/Item.js
@@ -459,7 +459,7 @@ export class Item extends AbstractStruct {
         // Let c in conflictingItems, b in itemsBeforeOrigin
         // ***{origin}bbbb{this}{c,b}{c,b}{o}***
         // Note that conflictingItems is a subset of itemsBeforeOrigin
-        while (o !== null && o !== this.right) {
+        while (o != null && o !== this.right) {
           itemsBeforeOrigin.add(o)
           conflictingItems.add(o)
           if (compareIDs(this.origin, o.origin)) {