diff --git a/packages/types/src/project/projects.d.ts b/packages/types/src/project/projects.d.ts
index ae1897d307..360a92c55d 100644
--- a/packages/types/src/project/projects.d.ts
+++ b/packages/types/src/project/projects.d.ts
@@ -85,15 +85,16 @@ export interface IProjectMemberLite {
 export type TProjectMembership = {
   member: string;
   role: TUserPermissions | EUserProjectRoles;
-  created_at: string;
 } & (
   | {
       id: string;
       original_role: EUserProjectRoles;
+      created_at: string;
     }
   | {
       id: null;
       original_role: null;
+      created_at: null;
     }
 );
 
diff --git a/web/core/store/member/base-project-member.store.ts b/web/core/store/member/base-project-member.store.ts
index 7051153068..40047b065c 100644
--- a/web/core/store/member/base-project-member.store.ts
+++ b/web/core/store/member/base-project-member.store.ts
@@ -177,7 +177,7 @@ export abstract class BaseProjectMemberStore implements IBaseProjectMemberStore
       original_role: projectMember.original_role,
       member: {
         ...userDetails,
-        joining_date: projectMember.created_at,
+        joining_date: projectMember.created_at ?? undefined,
       },
       created_at: projectMember.created_at,
     };