From ac0b799b114fef0ccd018eaff6284067297352f2 Mon Sep 17 00:00:00 2001
From: Jakob Ketterl <jakob.ketterl@gmx.de>
Date: Mon, 12 Feb 2024 22:55:17 +0100
Subject: [PATCH] fix zoom not working without a demodulator

---
 htdocs/openwebrx.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/htdocs/openwebrx.js b/htdocs/openwebrx.js
index 671b4938..1ab27d3f 100644
--- a/htdocs/openwebrx.js
+++ b/htdocs/openwebrx.js
@@ -673,7 +673,10 @@ function zoom_set(level) {
         zoom_level = parseFloat(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 demod = $('#openwebrx-panel-receiver').demodulatorPanel().getDemodulator();
+    if (demod) {
+        zoom_center_rel = demod.get_offset_frequency();
+    }
     zoom_center_where = 0.5 + (zoom_center_rel / bandwidth); //this is a kind of hack
     resize_canvases();
     mkscale();