From a9c2c7288ad529a6d524391a1f5c9b854d2890bf Mon Sep 17 00:00:00 2001
From: Jonathan G Rennison <j.g.rennison@gmail.com>
Date: Tue, 19 Oct 2021 00:50:05 +0100
Subject: [PATCH] Fix compilation when ENABLE_NETWORK_SYNC_EVERY_FRAME is
 defined

This is set by RANDOM_DEBUG

See also: https://github.com/OpenTTD/OpenTTD/issues/9624
---
 src/network/network_client.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/network/network_client.cpp b/src/network/network_client.cpp
index 1e76424559..0bb519e349 100644
--- a/src/network/network_client.cpp
+++ b/src/network/network_client.cpp
@@ -1051,7 +1051,11 @@ NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_FRAME(Packet *p
 #ifdef ENABLE_NETWORK_SYNC_EVERY_FRAME
 	/* Test if the server supports this option
 	 *  and if we are at the frame the server is */
-	if (p->pos + 1 < p->size) {
+#ifdef NETWORK_SEND_DOUBLE_SEED
+	if (p->CanReadFromPacket(4 + 4 + 8)) {
+#else
+	if (p->CanReadFromPacket(4 + 8)) {
+#endif
 		_sync_frame = _frame_counter_server;
 		_sync_seed_1 = p->Recv_uint32();
 #ifdef NETWORK_SEND_DOUBLE_SEED