#25 Error message - mismatched file type

[Steve Lakin]

I tried to add a .bmp image file to an article and received
the following a Shouldn't Happen error:

-----start-----
Shouldn't happen:
Caught java.lang.NullPointerException
null
This message will be logged.
---- end -----

It would be useful to have a error trap in place for this
and similar mismatched file type occurrences