From caf4a3c58589e825d764e7104e68a32b3f82e3d0 Mon Sep 17 00:00:00 2001
From: Marat Fayzullin <luarvique@gmail.com>
Date: Thu, 6 Apr 2023 11:03:52 -0400
Subject: [PATCH] Fixing minor JavaScript error on startup.

---
 htdocs/openwebrx.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/htdocs/openwebrx.js b/htdocs/openwebrx.js
index 0d8a7eea..c191d026 100644
--- a/htdocs/openwebrx.js
+++ b/htdocs/openwebrx.js
@@ -948,7 +948,8 @@ function zoom_set(level) {
     level = parseInt(level);
     zoom_level = level;
     //zoom_center_rel=canvas_get_freq_offset(-canvases[0].offsetLeft+waterfallWidth()/2); //zoom to screen center instead of demod envelope
-    zoom_center_rel = $('#openwebrx-panel-receiver').demodulatorPanel().getDemodulator().get_offset_frequency();
+    var demodulator = $('#openwebrx-panel-receiver').demodulatorPanel().getDemodulator();
+    zoom_center_rel = demodulator != null? demodulator.get_offset_frequency() : 0;
     zoom_center_where = 0.5 + (zoom_center_rel / bandwidth); //this is a kind of hack
     resize_canvases(true);
     mkscale();