diff --git a/Source/WebKit/Platform/IPC/unix/ConnectionUnix.cpp b/Source/WebKit/Platform/IPC/unix/ConnectionUnix.cpp
index 87969d7f027e1..43091cc588639 100644
--- a/Source/WebKit/Platform/IPC/unix/ConnectionUnix.cpp
+++ b/Source/WebKit/Platform/IPC/unix/ConnectionUnix.cpp
@@ -647,6 +647,11 @@ pid_t readPIDFromPeer(int socket)
     if (ret == -1)
         g_error("readPIDFromPeer: Failed to read pid from PID socket: %s", g_strerror(errno));
 
+    if (ret == 0) {
+        // Peer died before sending PID (e.g. SIGTERM during container teardown).
+        return 0;
+    }
+
     if (message.msg_controllen <= 0)
         g_error("readPIDFromPeer: Unexpected short read from PID socket");
 
diff --git a/Source/WebKit/UIProcess/Launcher/glib/ProcessLauncherGLib.cpp b/Source/WebKit/UIProcess/Launcher/glib/ProcessLauncherGLib.cpp
index 271987adce84e..0e44b67f2f04b 100644
--- a/Source/WebKit/UIProcess/Launcher/glib/ProcessLauncherGLib.cpp
+++ b/Source/WebKit/UIProcess/Launcher/glib/ProcessLauncherGLib.cpp
@@ -258,7 +258,13 @@ void ProcessLauncher::launchProcess()
             g_error("Failed to read pid from child process");
 
         m_processID = IPC::readPIDFromPeer(g_socket_get_fd(pidSocket.get()));
-        RELEASE_ASSERT(m_processID);
+        if (!m_processID) {
+            m_socketMonitor.stop();
+            close(m_pidServerSocket);
+            m_pidServerSocket = -1;
+            didFinishLaunchingProcess(0, IPC::Connection::Identifier { });
+            return G_SOURCE_REMOVE;
+        }
 
         m_socketMonitor.stop();