Crash on stuff.co.nz due to null navigation_type

[shannonbooth]

The following verification has started crashing stuff.co.nz on load:

serenity/Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp

Line 733 in aede010

// 1. Assert: navigationType is not null.

Backtrace:

Program received signal SIGILL, Illegal instruction.
ak_verification_failed () at /home/shannon/personal/serenity/AK/Assertions.cpp:108
108         __builtin_trap();
(gdb) bt
#0  ak_verification_failed () at /home/shannon/personal/serenity/AK/Assertions.cpp:108
#1  0x00007fe7d0183f1f in apply_the_history_step () at /home/shannon/personal/serenity/Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp:734
#2  0x00007fe7d0184d00 in update_for_navigable_creation_or_destruction () at /home/shannon/personal/serenity/Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp:982
#3  0x00007fe7d0106770 in operator() () at /home/shannon/personal/serenity/Userland/Libraries/LibWeb/HTML/NavigableContainer.cpp:138
#4  call () at /home/shannon/personal/serenity/Meta/Lagom/../../AK/Function.h:192
#5  0x00007fe7cfe23319 in operator() () at /home/shannon/personal/serenity/Meta/Lagom/../../AK/Function.h:125
#6  0x00007fe7d0162174 in execute_steps () at /home/shannon/personal/serenity/Meta/Lagom/../../Userland/Libraries/LibWeb/HTML/SessionHistoryTraversalQueue.h:29
#7  operator() () at /home/shannon/personal/serenity/Userland/Libraries/LibWeb/HTML/SessionHistoryTraversalQueue.cpp:37
#8  call () at /home/shannon/personal/serenity/Meta/Lagom/../../AK/Function.h:192
#9  0x00007fe7cee62fd9 in operator() () at /home/shannon/personal/serenity/Meta/Lagom/../../AK/Function.h:125
#10 0x00007fe7cee62525 in dispatch_event () at /home/shannon/personal/serenity/Userland/Libraries/LibCore/EventReceiver.cpp:162
#11 0x0000559cb379de9d in qt_timer_fired () at /home/shannon/personal/serenity/Ladybird/Qt/EventLoopImplementationQt.cpp:88
#12 operator() () at /home/shannon/personal/serenity/Ladybird/Qt/EventLoopImplementationQt.cpp:102
#13 call () at /usr/include/x86_64-linux-gnu/qt6/QtCore/qobjectdefs_impl.h:146
#14 call<QtPrivate::List<>, void> () at /usr/include/x86_64-linux-gnu/qt6/QtCore/qobjectdefs_impl.h:256
#15 impl () at /usr/include/x86_64-linux-gnu/qt6/QtCore/qobjectdefs_impl.h:420
#16 0x00007fe7d16ed023 in ?? () from /lib/x86_64-linux-gnu/libQt6Core.so.6
#17 0x00007fe7d16fb4be in QTimer::timeout(QTimer::QPrivateSignal) () from /lib/x86_64-linux-gnu/libQt6Core.so.6