diff --git a/Utilities/StrUtil.h b/Utilities/StrUtil.h
index b5df886164..d274cc074d 100644
--- a/Utilities/StrUtil.h
+++ b/Utilities/StrUtil.h
@@ -188,7 +188,7 @@ namespace fmt
 				result.append(separator);
 		}
 
-		return result.append(source.back());
+		return result.append(*end);
 	}
 
 	template <typename T>
diff --git a/rpcs3/Emu/NP/np_handler.cpp b/rpcs3/Emu/NP/np_handler.cpp
index 777301abbb..9dc02f983c 100644
--- a/rpcs3/Emu/NP/np_handler.cpp
+++ b/rpcs3/Emu/NP/np_handler.cpp
@@ -1085,6 +1085,11 @@ namespace np
 
 	void np_handler::send_message(const message_data& msg_data, const std::set<std::string>& npids)
 	{
+		const std::string npids_string = fmt::format("\"%s\"", fmt::merge(npids, "\",\""));
+
+		rpcn_log.notice("Sending message to %s:", npids_string);
+		msg_data.print();
+
 		get_rpcn()->send_message(msg_data, npids);
 	}
 
diff --git a/rpcs3/Emu/NP/rpcn_client.cpp b/rpcs3/Emu/NP/rpcn_client.cpp
index a87fff8244..61ad839555 100644
--- a/rpcs3/Emu/NP/rpcn_client.cpp
+++ b/rpcs3/Emu/NP/rpcn_client.cpp
@@ -3122,6 +3122,7 @@ namespace rpcn
 
 		if (sdata.is_error())
 		{
+			rpcn_log.error("Error parsing MessageReceived notification");
 			return;
 		}
 
@@ -3143,6 +3144,9 @@ namespace rpcn
 		strcpy_trunc(mdata.commId.data, pb_mdata->communicationid());
 		mdata.data.assign(pb_mdata->data().begin(), pb_mdata->data().end());
 
+		rpcn_log.notice("Received message from %s:", sender);
+		mdata.print();
+
 		// Save the message and call callbacks
 		{
 			std::lock_guard lock(mutex_messages);