diff --git a/ui/src/lib/session-display.test.ts b/ui/src/lib/session-display.test.ts
index 923138fb4fd6..55c4895da137 100644
--- a/ui/src/lib/session-display.test.ts
+++ b/ui/src/lib/session-display.test.ts
@@ -26,6 +26,12 @@ describe("resolveSessionDisplayName", () => {
     expect(resolveSessionDisplayName("agent:main:imessage:direct:+4912")).toBe("iMessage · +4912");
   });
 
+  it("does not split UTF-16 surrogate pairs when shortening peer ids", () => {
+    expect(resolveSessionDisplayName("agent:main:telegram:direct:12345😀67890")).toBe(
+      "Telegram · …67890",
+    );
+  });
+
   it("falls back to a friendly name for dashboard sessions instead of the uuid key", () => {
     expect(
       resolveSessionDisplayName("agent:main:dashboard:0f9d5c1e-6d0f-4c9a-9d84-1c2f3a4b5c6d"),
diff --git a/ui/src/lib/session-display.ts b/ui/src/lib/session-display.ts
index 58d8dbe8b36c..4d57bd824da6 100644
--- a/ui/src/lib/session-display.ts
+++ b/ui/src/lib/session-display.ts
@@ -1,4 +1,5 @@
 // Control UI module implements session display behavior.
+import { sliceUtf16Safe } from "@openclaw/normalization-core/utf16-slice";
 import { normalizeLowercaseStringOrEmpty, normalizeOptionalString } from "./string-coerce.ts";
 
 const CHANNEL_LABELS: Record<string, string> = {
@@ -18,7 +19,7 @@ const KNOWN_CHANNEL_KEYS = Object.keys(CHANNEL_LABELS);
 /** Raw peer ids stay out of the sidebar; keep a short recognizable tail only. */
 function shortenPeerId(identifier: string): string {
   const trimmed = identifier.trim();
-  return trimmed.length <= 10 ? trimmed : `…${trimmed.slice(-6)}`;
+  return trimmed.length <= 10 ? trimmed : `…${sliceUtf16Safe(trimmed, -6)}`;
 }
 
 // Long hex/uuid runs inside keys and node ids are machine ids, not names;