Insert problem with Oracle using Nhibernate

Question

There is a CLOB field we are trying to insert html content and sometimes we are getting an error as:

ORA-01461: can bind a LONG value only for insert into a LONG column

When i used nhibernate profiler and copy the query to Toad, it asked me to enter values for variables called "NBSP"!

Is this means that nhibernate doesnt escape special chars?

if so how can i tell it to escape special chars globally?