diff --git a/api/src/chat/dto/conversation.dto.ts b/api/src/chat/dto/conversation.dto.ts
index 3567c593..cd8d4670 100644
--- a/api/src/chat/dto/conversation.dto.ts
+++ b/api/src/chat/dto/conversation.dto.ts
@@ -46,7 +46,7 @@ export class ConversationCreateDto {
   @IsObjectId({
     message: 'Current must be a valid objectId',
   })
-  current?: string;
+  current?: string | null;
 
   @ApiProperty({ description: 'next conversation', type: Array })
   @IsOptional()
diff --git a/api/src/chat/schemas/conversation.schema.ts b/api/src/chat/schemas/conversation.schema.ts
index efa21a60..e019ba15 100644
--- a/api/src/chat/schemas/conversation.schema.ts
+++ b/api/src/chat/schemas/conversation.schema.ts
@@ -80,8 +80,8 @@ export class Conversation extends ConversationStub {
   @Transform(({ obj }) => obj.sender.toString())
   sender: string;
 
-  @Transform(({ obj }) => obj.current.toString())
-  current: string;
+  @Transform(({ obj }) => (obj.current ? obj.current.toString() : null))
+  current: string | null;
 
   @Transform(({ obj }) => obj.next.map((elem) => elem.toString()))
   next: string[];