diff --git a/server/src/workflow-management/selector.ts b/server/src/workflow-management/selector.ts
index af7227e5..77df25bf 100644
--- a/server/src/workflow-management/selector.ts
+++ b/server/src/workflow-management/selector.ts
@@ -407,7 +407,12 @@ export const getSelectors = async (page: Page, coordinates: Coordinates) => {
          return null;
        }
 
+       function notEmpty<T>(value: T | null | undefined): value is T {
+         return value !== null && value !== undefined;
+       }
+
        
+
        
 };