From cd2e0a6460948a01c3b0daddd7d6163b7ce9ed9b Mon Sep 17 00:00:00 2001
From: Thays Grazia <thaystg@gmail.com>
Date: Thu, 9 Mar 2023 15:48:02 -0300
Subject: [PATCH] backport of 82852 (#82854)

---
 src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs b/src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs
index 21c79bd30afa44..15682c6dad1e30 100644
--- a/src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs
+++ b/src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs
@@ -175,6 +175,9 @@ protected override async Task<bool> AcceptEvent(SessionId sessionId, JObject par
                         if (!contexts.ContainsKey(sessionId))
                             return false;
 
+                        if (args?["callFrames"]?.Value<JArray>()?.Count == 0)
+                            return false;
+
                         //TODO figure out how to stich out more frames and, in particular what happens when real wasm is on the stack
                         string top_func = args?["callFrames"]?[0]?["functionName"]?.Value<string>();
                         switch (top_func) {