diff --git a/server/src/workflow-management/classes/Generator.ts b/server/src/workflow-management/classes/Generator.ts
index bc028fcd..f02b4eb9 100644
--- a/server/src/workflow-management/classes/Generator.ts
+++ b/server/src/workflow-management/classes/Generator.ts
@@ -69,6 +69,8 @@ export class WorkflowGenerator {
 
   private paginationMode: boolean = false;
 
+  private poolId: string | null = null;
+
   /**
    * The public constructor of the WorkflowGenerator.
    * Takes socket for communication as a parameter and registers some important events on it.