When all the delegates are the same object and internally the webcore cancels a load request it leads to a crash that ends at isFontFixedPitch() call that refers to a NULL delegate.
You'll need to provide a lot more information to make it possible to investigate this. A crash log at the very minimum, and example code that we can debug would be great.
(In reply to comment #1) > You'll need to provide a lot more information to make it possible to > investigate this. A crash log at the very minimum, and example code that we > can debug would be great. > As said above the crash log is absolutely required for crash bug reports. Exact steps to reproduce the bug are also required. In this state the bug report is INVALID. Karl, feel free to reopen the bug, but provide exact steps to reproduce the bug and attach crash log http://webkit.org/quality/crashlogs.html