From a3f678a7cad210fe796f4a76370996a1284da6d4 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de>
Date: Fri, 27 Nov 2015 01:20:13 +0100
Subject: [PATCH] session: make sure signals set is initialized

This fixes parts of bug #387.
---
 pv/session.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pv/session.cpp b/pv/session.cpp
index ef1159ee..0ac5bb72 100644
--- a/pv/session.cpp
+++ b/pv/session.cpp
@@ -579,6 +579,10 @@ void Session::feed_in_analog(shared_ptr<Analog> analog)
 	const float *data = static_cast<const float *>(analog->data_pointer());
 	bool sweep_beginning = false;
 
+	if (signals_.empty()) {
+		update_signals();
+	}
+
 	for (auto channel : channels)
 	{
 		shared_ptr<data::AnalogSegment> segment;
-- 
2.30.2