From 1876d0d3669147e68c64d7916082de64025e9b6f Mon Sep 17 00:00:00 2001
From: Muxi Yan <mxyan@google.com>
Date: Wed, 19 Dec 2018 13:06:34 -0800
Subject: [PATCH] ProtoRPC bug

---
 src/objective-c/ProtoRPC/ProtoRPC.m | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/objective-c/ProtoRPC/ProtoRPC.m b/src/objective-c/ProtoRPC/ProtoRPC.m
index 48a38bd35ac..03e6839c5a0 100644
--- a/src/objective-c/ProtoRPC/ProtoRPC.m
+++ b/src/objective-c/ProtoRPC/ProtoRPC.m
@@ -175,7 +175,7 @@ static NSError *ErrorForBadProto(id proto, Class expectedClass, NSError *parsing
 }
 
 - (void)writeMessage:(GPBMessage *)message {
-  NSAssert([message isKindOfClass:[GPBMessage class]]);
+  NSAssert([message isKindOfClass:[GPBMessage class]], @"Parameter message must be a GPBMessage");
   if (![message isKindOfClass:[GPBMessage class]]) {
     NSLog(@"Failed to send a message that is non-proto.");
     return;
@@ -199,7 +199,7 @@ static NSError *ErrorForBadProto(id proto, Class expectedClass, NSError *parsing
 
 - (void)didReceiveInitialMetadata:(NSDictionary *)initialMetadata {
   @synchronized(self) {
-    if (initialMetadata != nil && [_handler respondsToSelector:@selector(initialMetadata:)]) {
+    if (initialMetadata != nil && [_handler respondsToSelector:@selector(didReceiveInitialMetadata:)]) {
       dispatch_async(_dispatchQueue, ^{
         id<GRPCProtoResponseHandler> copiedHandler = nil;
         @synchronized(self) {