From 974c9eff75a1108bb0f6dc06e7373ecbf6ef6496 Mon Sep 17 00:00:00 2001
From: Alexey Grinevich <alexey.grinevich@inflectra.com>
Date: Fri, 20 Mar 2026 12:04:15 +0300
Subject: [PATCH] Fix: node process was dying (Check failed: !IsTheHole) when
 debugger was trying to display an IUnknown object due to missing "__type"
 return value.

---
 src/disp.cpp | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/src/disp.cpp b/src/disp.cpp
index 08fa1a6..b502f03 100644
--- a/src/disp.cpp
+++ b/src/disp.cpp
@@ -1104,9 +1104,18 @@ void VariantObject::NodeGet(Local<Name> name, const PropertyCallbackInfoGetter&
         std::wstring type, name;
         if (self->value.vt & VT_BYREF) type += L"byref:";
         if (self->value.vt & VT_ARRAY) type = L"array:";
-        if (vtypes.find(self->value.vt & VT_TYPEMASK, name)) type += name;
-        else type += std::to_wstring(self->value.vt & VT_TYPEMASK);
+        if (vtypes.find(self->value.vt & VT_TYPEMASK, name)) {
+            type += name;
+        }
+        else if (self->value.vt & VT_UNKNOWN) {
+            type += L"IUnknown";
+        }
+        else {
+            type += std::to_wstring(self->value.vt & VT_TYPEMASK);
+        }
         Local<String> text = v8str(isolate, type.c_str());
+        // Debugger was crashing on IUnknown due to missing return value here
+        args.GetReturnValue().Set(text);
     }
     else if (_wcsicmp(id, L"__proto__") == 0) {
         Local<Function> func;
@@ -1123,10 +1132,10 @@ void VariantObject::NodeGet(Local<Name> name, const PropertyCallbackInfoGetter&
         if ((self->value.vt & VT_ARRAY) != 0) {
             args.GetReturnValue().Set((uint32_t)self->value.ArrayLength());
         }
-		else {
-			args.GetReturnValue().SetUndefined();
-		}
-	}
+        else {
+            args.GetReturnValue().SetUndefined();
+        }
+    }
     else {
         Local<Function> func;
         if (clazz_methods.get(isolate, id, &func)) {