1 files changed, 15 insertions, 2 deletions
diff --git a/conformance/conformance_cpp.cc b/conformance/conformance_cpp.cc
index 863b6a5b..1a265493 100644
--- a/conformance/conformance_cpp.cc
+++ b/conformance/conformance_cpp.cc
@@ -108,7 +108,11 @@ void DoTest(const ConformanceRequest& request, ConformanceResponse* response) {
         return;
       }
 
-      GOOGLE_CHECK(test_message.ParseFromString(proto_binary));
+      if (!test_message.ParseFromString(proto_binary)) {
+        response->set_runtime_error(
+            "Parsing JSON generates invalid proto output.");
+        return;
+      }
       break;
     }
 
@@ -132,9 +136,18 @@ void DoTest(const ConformanceRequest& request, ConformanceResponse* response) {
       GOOGLE_CHECK(test_message.SerializeToString(&proto_binary));
       Status status = BinaryToJsonString(type_resolver, *type_url, proto_binary,
                                          response->mutable_json_payload());
-      GOOGLE_CHECK(status.ok());
+      if (!status.ok()) {
+        response->set_serialize_error(
+            string("Failed to serialize JSON output: ") +
+            status.error_message().as_string());
+        return;
+      }
       break;
     }
+
+    default:
+      GOOGLE_LOG(FATAL) << "Unknown output format: "
+                        << request.requested_output_format();
   }
 }