diff --git a/go.mod b/go.mod
index 7ae5d15b..f6c37d76 100644
--- a/go.mod
+++ b/go.mod
@@ -36,7 +36,7 @@ require (
 	golang.org/x/sync v0.16.0
 	golang.org/x/tools v0.36.0
 	gopkg.in/yaml.v3 v3.0.1
-	maunium.net/go/mautrix v0.25.1-0.20250912163005-3a6f20bb623c
+	maunium.net/go/mautrix v0.25.1-0.20250912223806-717c8c309260
 	rsc.io/qr v0.2.0
 )
 
diff --git a/go.sum b/go.sum
index 204cebde..6601c018 100644
--- a/go.sum
+++ b/go.sum
@@ -193,7 +193,7 @@ gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 maunium.net/go/mauflag v1.0.0 h1:YiaRc0tEI3toYtJMRIfjP+jklH45uDHtT80nUamyD4M=
 maunium.net/go/mauflag v1.0.0/go.mod h1:nLivPOpTpHnpzEh8jEdSL9UqO9+/KBJFmNRlwKfkPeA=
-maunium.net/go/mautrix v0.25.1-0.20250912163005-3a6f20bb623c h1:LGQOEpTEv71bZg+ri5rWZbHEzJs1QoMIZddzFAaX5vw=
-maunium.net/go/mautrix v0.25.1-0.20250912163005-3a6f20bb623c/go.mod h1:pDd6Ppg+1PbWrw/rg4ZQQfVYZICRGzH+DcliZ/BODvU=
+maunium.net/go/mautrix v0.25.1-0.20250912223806-717c8c309260 h1:KfsguTzQeONUYg5EDMx6KMVkKToJYAYRAtXOj+45Imk=
+maunium.net/go/mautrix v0.25.1-0.20250912223806-717c8c309260/go.mod h1:pDd6Ppg+1PbWrw/rg4ZQQfVYZICRGzH+DcliZ/BODvU=
 rsc.io/qr v0.2.0 h1:6vBLea5/NRMVTz8V66gipeLycZMl/+UlFmk8DvqQ6WY=
 rsc.io/qr v0.2.0/go.mod h1:IF+uZjkb9fqyeF/4tlBoynqmQxUoPfWEKh921coOuXs=
diff --git a/pkg/connector/store/upgrades/00-latest.sql b/pkg/connector/store/upgrades/00-latest.sql
index 0b064fa9..27579f2e 100644
--- a/pkg/connector/store/upgrades/00-latest.sql
+++ b/pkg/connector/store/upgrades/00-latest.sql
@@ -1,4 +1,4 @@
--- v0 -> v3 (compatible with v2+): Latest revision
+-- v0 -> v4 (compatible with v2+): Latest revision
 
 CREATE TABLE telegram_user_state (
     user_id BIGINT NOT NULL PRIMARY KEY,
diff --git a/pkg/connector/store/upgrades/04-fix-invalid-disappearing-timers.sql b/pkg/connector/store/upgrades/04-fix-invalid-disappearing-timers.sql
new file mode 100644
index 00000000..d6b8ea36
--- /dev/null
+++ b/pkg/connector/store/upgrades/04-fix-invalid-disappearing-timers.sql
@@ -0,0 +1,4 @@
+-- v4 (compatible with v2+): Clear invalid disappearing timers in portal table
+UPDATE portal
+SET disappear_type=NULL, disappear_timer=NULL
+WHERE disappear_timer=0 OR disappear_timer IS NULL OR disappear_type IS NULL;
diff --git a/pkg/connector/telegram.go b/pkg/connector/telegram.go
index 26fa8d56..a73883e4 100644
--- a/pkg/connector/telegram.go
+++ b/pkg/connector/telegram.go
@@ -359,7 +359,7 @@ func (t *TelegramClient) onUpdateNewMessage(ctx context.Context, entities tg.Ent
 			setting := database.DisappearingSetting{
 				Type:  event.DisappearingTypeAfterSend,
 				Timer: time.Duration(action.Period) * time.Second,
-			}
+			}.Normalize()
 			res := t.main.Bridge.QueueRemoteEvent(t.userLogin, &simplevent.ChatInfoChange{
 				EventMeta: eventMeta.WithType(bridgev2.RemoteEventChatInfoChange),
 				ChatInfoChange: &bridgev2.ChatInfoChange{