diff --git a/frontend/index.html b/frontend/index.html
index 25392c0..840e52a 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -2546,15 +2546,22 @@ async function startCapture() {
     }
 }
 
-async function stopCapture() {
+// Stopping when nothing is capturing answers 400 ('No active capture'), and
+// 403 when capture is disabled — both mean "there is no capture to stop",
+// not a failure.
+async function stopCaptureIfRunning() {
     try {
         await API.stopCapture();
-        STATE.captureActive = false;
-        STATE.currentSessionId = null;
-        STATE.sessionViewId = null;
-        updateCaptureButton();
-        updateStatus();
-    } catch (e) {}
+    } catch (e) { /* nothing to stop */ }
+}
+
+async function stopCapture() {
+    await stopCaptureIfRunning();
+    STATE.captureActive = false;
+    STATE.currentSessionId = null;
+    STATE.sessionViewId = null;
+    updateCaptureButton();
+    updateStatus();
 }
 
 function updateCaptureButton() {
@@ -2891,8 +2898,9 @@ async function confirmComprionImport() {
 async function loadSession(id) {
     if (STATE.captureActive && !confirm(t('Opening a session stops the active capture. Continue?'))) return;
     try {
-        // Stop any active capture so it can't write into the session being viewed.
-        await API.stopCapture();
+        // Stop any active capture so it can't write into the session being
+        // viewed (a 400/403 means there is none — not an error).
+        await stopCaptureIfRunning();
         STATE.captureActive = false;
         STATE.currentSessionId = null;
         stopPolling();
@@ -3164,7 +3172,7 @@ function onFilterChange() {
 }
 
 // ──────────────────── Versioning ────────────────────
-const PWA_VERSION = '2.4.0';
+const PWA_VERSION = '2.4.1';
 const MIN_SERVER_VERSION = '2.3.0';
 
 function parseVersion(v) {
diff --git a/frontend/sw.js b/frontend/sw.js
index 6c14a72..46b983c 100644
--- a/frontend/sw.js
+++ b/frontend/sw.js
@@ -1,4 +1,4 @@
-const CACHE = 'simtrace-analyser-v65';
+const CACHE = 'simtrace-analyser-v66';
 
 const PRECACHE = [
     'index.html',
diff --git a/frontend/tests/comprion.test.js b/frontend/tests/comprion.test.js
index 194a7e1..325ca2b 100644
--- a/frontend/tests/comprion.test.js
+++ b/frontend/tests/comprion.test.js
@@ -498,3 +498,29 @@ test('Change details modal: header, summary, legend and both views', () => {
 	assert.match(el('file-diff-sub').textContent, /Record 2 \/ 5/);
 	assert.match(el('file-diff-body').innerHTML, /image is frozen/);
 });
+
+// ── Session loading must survive "no active capture" ───────────────────
+eval(extractFunc(src, 'stopCaptureIfRunning'));
+
+test('stopCaptureIfRunning tolerates "no active capture" (400)', async () => {
+	let calls = 0;
+	API.stopCapture = async () => {
+		calls++;
+		throw Object.assign(new Error('No active capture'), {status: 400});
+	};
+	await stopCaptureIfRunning();          // must resolve, not reject
+	assert.equal(calls, 1);
+	API.stopCapture = async () => { calls++; };
+	await stopCaptureIfRunning();
+	assert.equal(calls, 2);
+});
+
+test('loadSession stops a capture tolerantly', () => {
+	const body = extractFunc(src, 'loadSession');
+	assert.match(body, /await stopCaptureIfRunning\(\)/);
+	assert.doesNotMatch(body, /await API\.stopCapture\(\)/);
+	// The capture button also resets its state after a tolerated stop.
+	const stop = extractFunc(src, 'stopCapture');
+	assert.match(stop, /await stopCaptureIfRunning\(\)/);
+	assert.match(stop, /STATE\.captureActive = false;/);
+});
diff --git a/pyproject.toml b/pyproject.toml
index b4bf5d7..41276e8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.backends._legacy:_Backend"
 
 [project]
 name = "simtrace-analyser"
-version = "2.4.0"
+version = "2.4.1"
 description = "SIMtrace Analyser — APDU trace analyser for GSMTAP/PCAP captures (bundles the simtrace2-pysniff utility)"
 readme = {file = "README.md", content-type = "text/markdown"}
 license = {text = "GPL-2.0-or-later"}
diff --git a/simtrace_analyser/version.py b/simtrace_analyser/version.py
index 2c9091b..e756343 100644
--- a/simtrace_analyser/version.py
+++ b/simtrace_analyser/version.py
@@ -1,3 +1,3 @@
 """Single source of truth for the SIMtrace Analyser version."""
 
-__version__ = '2.4.0'
+__version__ = '2.4.1'
diff --git a/tests/test_pcap_import.py b/tests/test_pcap_import.py
index 62e8dc7..13748aa 100644
--- a/tests/test_pcap_import.py
+++ b/tests/test_pcap_import.py
@@ -224,7 +224,7 @@ class TestImportEndpoint(unittest.TestCase):
 class TestVersion(unittest.TestCase):
     def test_package_version(self):
         from simtrace2_pysniff import __version__
-        self.assertEqual(__version__, '2.4.0')
+        self.assertEqual(__version__, '2.4.1')
 
     def test_status_includes_version(self):
         import os