Thread:Project:Support desk/Issue with USARSim wiki

We use a wiki with out project USARSim hosted on sourceforge, http://usatsim.sourceforge.net. we are recently experiencing problems with editing the wiki. we get following error each time a modification is made to a page:

Database error

A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was: (SQL query hidden) from within function "Revision::insertOn". MySQL returned error "1048: Column 'old_text' cannot be null (mysql-u)".

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Any help is highly appreciated.