From 16e7e7d04765ffdb07a491f1f3b1607006707130 Mon Sep 17 00:00:00 2001
From: Ernesto Castellotti <mail@ernestocastellotti.it>
Date: Wed, 11 Jan 2023 19:22:18 +0100
Subject: closePortLineBreak prevent undefined errors

---
 assets/js/serialUtil.js | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/assets/js/serialUtil.js b/assets/js/serialUtil.js
index 8ce3c6e..c4d6d84 100644
--- a/assets/js/serialUtil.js
+++ b/assets/js/serialUtil.js
@@ -21,9 +21,23 @@ async function openPortLineBreak(port, baudRate, outputErrorCallback) {
 }
 
 async function closePortLineBreak(port, reader, writer, readableStreamClosed, writerStreamClosed) {
-    reader.cancel();
-    await readableStreamClosed.catch(() => { /* Ignore the error */ });
-    writer.close();
-    await writerStreamClosed;
-    await port.close();
+    if (reader) {
+        reader.cancel();
+    }
+
+    if (readableStreamClosed) {
+        await readableStreamClosed.catch(() => { /* Ignore the error */ });
+    }
+
+    if (writer) {
+        writer.close();
+    }
+
+    if (writerStreamClosed) {
+        await writerStreamClosed;
+    }
+
+    if (port) {
+        await port.close();
+    }
 }
-- 
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