--- a/src/portals/Screencopy.cpp
+++ b/src/portals/Screencopy.cpp
@@ -625,6 +625,19 @@
     return m_sState.toplevel;
 }
 
+// A shared window went away: close its sessions like other portals do, so the
+// app's track ends instead of streaming the last frame forever.
+void CScreencopyPortal::onToplevelClosed(CCZwlrForeignToplevelHandleV1* handle) {
+    for (auto& s : m_vSessions) {
+        if (!s->session || s->selection.type != TYPE_WINDOW || s->selection.windowHandle.get() != handle)
+            continue;
+
+        Debug::log(LOG, "[screencopy] Shared window closed, closing session {}", s->sessionHandle.c_str());
+        s->session->object->emitSignal("Closed").onInterface(sdbus::InterfaceName{"org.freedesktop.impl.portal.Session"});
+        s->session->onDestroy();
+    }
+}
+
 CScreencopyPortal::SSession* CScreencopyPortal::getSession(sdbus::ObjectPath& path) {
     for (auto& s : m_vSessions) {
         if (s->sessionHandle == path)
--- a/src/portals/Screencopy.hpp
+++ b/src/portals/Screencopy.hpp
@@ -113,6 +113,7 @@
     void                                 startFrameCopy(SSession* pSession);
     void                                 queueNextShareFrame(SSession* pSession);
     bool                                 hasToplevelCapabilities();
+    void                                 onToplevelClosed(CCZwlrForeignToplevelHandleV1* handle);
 
     std::unique_ptr<CPipewireConnection> m_pPipewire;
 
--- a/src/shared/ToplevelManager.cpp
+++ b/src/shared/ToplevelManager.cpp
@@ -18,6 +18,9 @@
     handle->setClosed([this](CCZwlrForeignToplevelHandleV1* r) {
         Debug::log(TRACE, "[toplevel] toplevel at {} closed", (void*)this);
 
+        if (g_pPortalManager->m_sPortals.screencopy)
+            g_pPortalManager->m_sPortals.screencopy->onToplevelClosed(r);
+
         std::erase_if(g_pPortalManager->m_sHelpers.toplevel->m_vToplevels, [&](const auto& e) { return e.get() == this; });
         if (g_pPortalManager->m_sHelpers.toplevelMapping)
             g_pPortalManager->m_sHelpers.toplevelMapping->m_muAddresses.erase(this->handle);