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-rw-r--r--lib/js/urweb.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/js/urweb.js b/lib/js/urweb.js
index 68e7979d..b871b8e5 100644
--- a/lib/js/urweb.js
+++ b/lib/js/urweb.js
@@ -731,6 +731,8 @@ function flattenLocal(s) {
// Dynamic tree management
function populate(node) {
+ if (node.dead) return;
+
var s = node.signal;
var oldSources = node.sources;
try {