diff --git a/crates/projection-xmpp/src/iq.rs b/crates/projection-xmpp/src/iq.rs
index d9351bf..a4cfdcc 100644
--- a/crates/projection-xmpp/src/iq.rs
+++ b/crates/projection-xmpp/src/iq.rs
@@ -5,7 +5,7 @@ use quick_xml::events::Event;
 use lavina_core::room::RoomId;
 use lavina_core::LavinaCore;
 use proto_xmpp::bind::{BindRequest, BindResponse, Jid, Name, Server};
-use proto_xmpp::client::{Iq, IqError, IqErrorType, IqType};
+use proto_xmpp::client::{Iq, IqError, IqErrorCondition, IqErrorType, IqType};
 use proto_xmpp::disco::{Feature, Identity, InfoQuery, Item, ItemQuery};
 use proto_xmpp::mam::{Fin, Set};
 use proto_xmpp::roster::RosterQuery;
@@ -104,6 +104,7 @@ impl<'a> XmppConnection<'a> {
                     r#type: IqType::Error,
                     body: IqError {
                         r#type: IqErrorType::Cancel,
+                        condition: None,
                     },
                 };
                 req.serialize(output);
@@ -172,6 +173,7 @@ impl<'a> XmppConnection<'a> {
                     // </error>
                     return Err(IqError {
                         r#type: IqErrorType::Cancel,
+                        condition: Some(IqErrorCondition::ItemNotFound),
                     });
                 };
                 identity = vec![Identity {
diff --git a/crates/proto-xmpp/src/client.rs b/crates/proto-xmpp/src/client.rs
index 08d203a..c515e63 100644
--- a/crates/proto-xmpp/src/client.rs
+++ b/crates/proto-xmpp/src/client.rs
@@ -260,6 +260,18 @@ impl MessageType {
 /// https://xmpp.org/rfcs/rfc6120.html#stanzas-error
 pub struct IqError {
     pub r#type: IqErrorType,
+    pub condition: Option<IqErrorCondition>,
+}
+
+pub enum IqErrorCondition {
+    ItemNotFound,
+}
+impl IqErrorCondition {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            IqErrorCondition::ItemNotFound => "item-not-found",
+        }
+    }
 }
 
 pub enum IqErrorType {
@@ -289,7 +301,18 @@ impl IqErrorType {
 impl ToXml for IqError {
     fn serialize(&self, events: &mut Vec<Event<'static>>) {
         let bytes = BytesStart::new(format!(r#"error xmlns="{}" type="{}""#, XMLNS, self.r#type.as_str()));
-        events.push(Event::Empty(bytes));
+        match self.condition {
+            None => {
+                events.push(Event::Empty(bytes));
+            }
+            Some(IqErrorCondition::ItemNotFound) => {
+                events.push(Event::Start(bytes));
+                let bytes2 = BytesStart::new(r#"item-not-found xmlns="urn:ietf:params:xml:ns:xmpp-stanzas""#);
+                events.push(Event::Empty(bytes2));
+                let bytes = BytesEnd::new("error");
+                events.push(Event::End(bytes));
+            }
+        }
     }
 }