Fix cluster-fuzz found regression with d8 Workers

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 7db6f3ed9e442081528e05140bd25b8911e26cb6..0b737c6ffe291e6913269f0618d4608127fe5210 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -2024,6 +2024,9 @@ bool Shell::SerializeValue(Isolate* isolate, Handle<Value> value,
         if (!SerializeValue(isolate, element_value, to_transfer, seen_objects,
                             out_data))
           return false;
+      } else {
+        Throw(isolate, "Failed to serialize array element.");
+        return false;
       }
     }
   } else if (value->IsArrayBuffer()) {
@@ -2098,6 +2101,9 @@ bool Shell::SerializeValue(Isolate* isolate, Handle<Value> value,
         if (!SerializeValue(isolate, property_value, to_transfer, seen_objects,
                             out_data))
           return false;
+      } else {
+        Throw(isolate, "Failed to serialize property.");
+        return false;
       }
     }
   } else {