from the log file I can see what's going wrong, but I still don't understand why that happens. When you hit Ctrl+W FS Recorder first gets the next aircraft ID, then tries to get information for that ID. That's the point where the error occurs, the ID seems to be invalid as FSX doesn't return any data for it.
I tried several things here, but still couldn't reproduce it.
Some more questions: If you hit Ctrl+W while no playback is running (but with FSX AI traffic present), do you get the same error? Which other add-ons do you have installed? What happens if you disable the option "Display Title/Aircraft on Change" in the camera settings dialog and then use Ctrl+W?