diff --git a/packages/sdk/src/document/change/change_id.ts b/packages/sdk/src/document/change/change_id.ts
index 74e09ee2c..fb7c53ae6 100644
--- a/packages/sdk/src/document/change/change_id.ts
+++ b/packages/sdk/src/document/change/change_id.ts
@@ -131,7 +131,7 @@ export class ChangeID {
   }
 
   /**
-   * `setVersionVector` sets the given actor.
+   * `setVersionVector` sets the given version vector.
    */
   public setVersionVector(versionVector: VersionVector): ChangeID {
     return new ChangeID(
diff --git a/packages/sdk/src/document/time/version_vector.ts b/packages/sdk/src/document/time/version_vector.ts
index 527fdfda4..97da9ae3b 100644
--- a/packages/sdk/src/document/time/version_vector.ts
+++ b/packages/sdk/src/document/time/version_vector.ts
@@ -95,7 +95,7 @@ export class VersionVector {
   public afterOrEqual(other: TimeTicket) {
     const lamport = this.vector.get(other.getActorID());
 
-    if (!lamport) {
+    if (lamport === undefined) {
       return false;
     }
 
@@ -122,7 +122,7 @@ export class VersionVector {
     for (const [actorID] of versionVector) {
       const lamport = this.vector.get(actorID);
 
-      if (lamport) {
+      if (lamport !== undefined) {
         filtered.set(actorID, lamport);
       }
     }