diff --git a/src/api/client_server/membership.rs b/src/api/client_server/membership.rs
index 73e817b6..c60a8fcc 100644
--- a/src/api/client_server/membership.rs
+++ b/src/api/client_server/membership.rs
@@ -224,6 +224,15 @@ pub async fn invite_user_route(body: Ruma<invite_user::v3::Request>) -> Result<i
 pub async fn kick_user_route(body: Ruma<kick_user::v3::Request>) -> Result<kick_user::v3::Response> {
 	let sender_user = body.sender_user.as_ref().expect("user is authenticated");
 
+	if let Ok(true) = services()
+		.rooms
+		.state_cache
+		.is_left(sender_user, &body.room_id)
+	{
+		info!("{} is not in room {}", &body.user_id, &body.room_id);
+		return Ok(kick_user::v3::Response {});
+	}
+
 	let mut event: RoomMemberEventContent = serde_json::from_str(
 		services()
 			.rooms
@@ -280,6 +289,17 @@ pub async fn kick_user_route(body: Ruma<kick_user::v3::Request>) -> Result<kick_
 pub async fn ban_user_route(body: Ruma<ban_user::v3::Request>) -> Result<ban_user::v3::Response> {
 	let sender_user = body.sender_user.as_ref().expect("user is authenticated");
 
+	if let Ok(Some(membership_event)) = services()
+		.rooms
+		.state_accessor
+		.get_member(&body.room_id, sender_user)
+	{
+		if membership_event.membership == MembershipState::Ban {
+			info!("{} is already banned in {}", &body.user_id, &body.room_id);
+			return Ok(ban_user::v3::Response {});
+		}
+	}
+
 	let event = services()
 		.rooms
 		.state_accessor
@@ -355,6 +375,17 @@ pub async fn ban_user_route(body: Ruma<ban_user::v3::Request>) -> Result<ban_use
 pub async fn unban_user_route(body: Ruma<unban_user::v3::Request>) -> Result<unban_user::v3::Response> {
 	let sender_user = body.sender_user.as_ref().expect("user is authenticated");
 
+	if let Ok(Some(membership_event)) = services()
+		.rooms
+		.state_accessor
+		.get_member(&body.room_id, sender_user)
+	{
+		if membership_event.membership != MembershipState::Ban {
+			info!("{} is already unbanned in {}", &body.user_id, &body.room_id);
+			return Ok(unban_user::v3::Response {});
+		}
+	}
+
 	let mut event: RoomMemberEventContent = serde_json::from_str(
 		services()
 			.rooms
@@ -524,6 +555,13 @@ pub(crate) async fn join_room_by_id_helper(
 ) -> Result<join_room_by_id::v3::Response> {
 	let sender_user = sender_user.expect("user is authenticated");
 
+	if let Ok(true) = services().rooms.state_cache.is_joined(sender_user, room_id) {
+		info!("{sender_user} is already joined in {room_id}");
+		return Ok(join_room_by_id::v3::Response {
+			room_id: room_id.into(),
+		});
+	}
+
 	let mutex_state = Arc::clone(
 		services()
 			.globals