From e828edd6ae226d702bbabce24c9940e55009fad2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Leon=20B=C3=B6ttger?= <leon.boettger@icloud.com>
Date: Sun, 8 Mar 2026 15:44:25 +0100
Subject: [PATCH] Better error handling

---
 NearbyShare/Connection/NearbyConnection.swift | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/NearbyShare/Connection/NearbyConnection.swift b/NearbyShare/Connection/NearbyConnection.swift
index 9edf192..f947bb7 100644
--- a/NearbyShare/Connection/NearbyConnection.swift
+++ b/NearbyShare/Connection/NearbyConnection.swift
@@ -189,7 +189,14 @@ class NearbyConnection {
             }
             guard let content = content else {
                 log("[NearbyConnection \(self.id)] Received nil content during receiveFrameAsync(). IsComplete: \(isComplete)")
-                assertionFailure()
+                self.lastError = NearbyError.protocolError("Received empty frame header")
+                self.protocolError()
+                return
+            }
+            guard content.count == 4 else {
+                log("[NearbyConnection \(self.id)] Received invalid frame header size \(content.count), expected 4")
+                self.lastError = NearbyError.protocolError("Unexpected frame header length")
+                self.protocolError()
                 return
             }
             let frameLength = UInt32(content[0]) << 24 | UInt32(content[1]) << 16 | UInt32(content[2]) << 8 | UInt32(content[3])