This happens sometimes when loading https://chat.openai.com/ in Ladybird.

Full backtrace with GDB:

VERIFICATION FAILED: maybe_line.value().is_empty() at /home/kling/src/serenity/Userland/Libraries/LibHTTP/Job.cpp:551

#0  ak_verification_failed (
    message=0x7f4bbb332911 "maybe_line.value().is_empty() at /home/kling/src/serenity/Userland/Libraries/LibHTTP/Job.cpp:551")
    at /home/kling/src/serenity/AK/Assertions.cpp:108
#1  0x00007f4bbb3407bc in HTTP::Job::on_socket_connected()::$_1::operator()() const (this=<optimized out>)
    at /home/kling/src/serenity/Userland/Libraries/LibHTTP/Job.cpp:551
#2  0x00007f4bbb33e156 in AK::Function<void ()>::operator()() const (this=<optimized out>)
    at /home/kling/src/serenity/Meta/Lagom/../../AK/Function.h:115
#3  HTTP::Job::register_on_ready_to_read(AK::Function<void ()>)::$_0::operator()() const (this=0x563e4c3c2b38)
    at /home/kling/src/serenity/Userland/Libraries/LibHTTP/Job.cpp:160
#4  AK::Function<void ()>::CallableWrapper<HTTP::Job::register_on_ready_to_read(AK::Function<void ()>)::$_0>::call() (this=0x563e4c3c2b30)
    at /home/kling/src/serenity/Meta/Lagom/../../AK/Function.h:182
#5  0x0000563e4a898611 in AK::Function<void ()>::operator()() const (this=<optimized out>)
    at /home/kling/src/serenity/Meta/Lagom/../../AK/Function.h:115
#6  Core::BufferedSocket<TLS::TLSv12>::setup_notifier()::{lambda()#1}::operator()() const (this=<optimized out>)
    at /home/kling/src/serenity/Meta/Lagom/../../Userland/Libraries/LibCore/Socket.h:436
#7  AK::Function<void ()>::CallableWrapper<Core::BufferedSocket<TLS::TLSv12>::setup_notifier()::{lambda()#1}>::call() (
    this=<optimized out>) at /home/kling/src/serenity/Meta/Lagom/../../AK/Function.h:182
#8  0x00007f4bbb31554c in AK::Function<void ()>::operator()() const (this=<optimized out>)
    at /home/kling/src/serenity/Meta/Lagom/../../AK/Function.h:115
#9  TLS::TLSv12::notify_client_for_app_data (this=this@entry=0x563e4be2c6f0)
    at /home/kling/src/serenity/Userland/Libraries/LibTLS/Socket.cpp:140
#10 0x00007f4bbb315733 in TLS::TLSv12::read_from_socket()::$_0::operator()() const (this=<optimized out>)
    at /home/kling/src/serenity/Userland/Libraries/LibTLS/Socket.cpp:160
#11 AK::ScopeGuard<TLS::TLSv12::read_from_socket()::$_0>::~ScopeGuard() (this=<optimized out>)
    at /home/kling/src/serenity/Meta/Lagom/../../AK/ScopeGuard.h:23
#12 TLS::TLSv12::read_from_socket (this=0x563e4be2c6f0) at /home/kling/src/serenity/Userland/Libraries/LibTLS/Socket.cpp:186
#13 0x00007f4bbb316036 in TLS::TLSv12::setup_connection()::$_0::operator()() const::{lambda()#1}::operator()() const (
    this=<optimized out>) at /home/kling/src/serenity/Userland/Libraries/LibTLS/Socket.cpp:102
#14 AK::Function<void ()>::CallableWrapper<TLS::TLSv12::setup_connection()::$_0::operator()() const::{lambda()#1}>::call() (
    this=<optimized out>) at /home/kling/src/serenity/Meta/Lagom/../../AK/Function.h:182
#15 0x00007f4bbb1f48b1 in AK::Function<void ()>::operator()() const (this=<optimized out>)
    at /home/kling/src/serenity/Meta/Lagom/../../AK/Function.h:115
#16 Core::TCPSocket::setup_notifier()::{lambda()#1}::operator()() const (this=<optimized out>)
    at /home/kling/src/serenity/Meta/Lagom/../../Userland/Libraries/LibCore/Socket.h:209
#17 AK::Function<void ()>::CallableWrapper<Core::TCPSocket::setup_notifier()::{lambda()#1}>::call() (this=<optimized out>)
    at /home/kling/src/serenity/Meta/Lagom/../../AK/Function.h:182
#18 0x00007f4bbb1eac30 in AK::Function<void ()>::operator()() const (this=<optimized out>)
    at /home/kling/src/serenity/Meta/Lagom/../../AK/Function.h:115
#19 Core::Notifier::event (this=0x563e4c2fa840, event=...) at /home/kling/src/serenity/Userland/Libraries/LibCore/Notifier.cpp:48
#20 0x00007f4bbb1e2db5 in Core::EventReceiver::dispatch_event (this=<optimized out>, e=..., stay_within=0x0) at /home/kling/src/serenity/Userland/Libraries/LibCore/EventReceiver.cpp:163
#21 0x00007f4bbb200131 in Core::ThreadEventQueue::process (this=0x563e4bf39f50) at /home/kling/src/serenity/Userland/Libraries/LibCore/ThreadEventQueue.cpp:111
#22 0x00007f4bbb1dd53c in Core::EventLoopImplementationUnix::pump (this=0x563e4bdedc30, mode=Core::EventLoopImplementation::PumpMode::WaitForEvents)
    at /home/kling/src/serenity/Userland/Libraries/LibCore/EventLoopImplementationUnix.cpp:109
#23 Core::EventLoopImplementationUnix::exec (this=0x563e4bdedc30) at /home/kling/src/serenity/Userland/Libraries/LibCore/EventLoopImplementationUnix.cpp:101
#24 0x00007f4bbb1dc722 in Core::EventLoop::exec (this=0x7ffc281225a8) at /home/kling/src/serenity/Userland/Libraries/LibCore/EventLoop.cpp:86
#25 0x0000563e4a88a4f7 in serenity_main (arguments=...) at /home/kling/src/serenity/Ladybird/RequestServer/main.cpp:62
#26 0x0000563e4a8b1823 in main (argc=5, argv=0x7ffc28122848) at /home/kling/src/serenity/Userland/Libraries/LibMain/Main.cpp:39

cc @alimpfard