diff --git a/wgengine/magicsock/magicsock.go b/wgengine/magicsock/magicsock.go
index 844a607cf..b17aa11ae 100644
--- a/wgengine/magicsock/magicsock.go
+++ b/wgengine/magicsock/magicsock.go
@@ -2958,8 +2958,13 @@ func (c *Conn) onNodeViewsUpdate(update NodeViewsUpdate) {
 	filt := c.filt
 	self := c.self
 	peers := c.peers
+	isClosed := c.closed
 	c.mu.Unlock() // release c.mu before potentially calling c.updateRelayServersSet which is O(m * n)
 
+	if isClosed {
+		return // nothing to do here, the conn is closed and the update is no longer relevant
+	}
+
 	if peersChanged || relayClientChanged {
 		if !relayClientEnabled {
 			c.relayManager.handleRelayServersSet(nil)