TDS incoming tabular data stream is incorrect. Data Type 0xFF is unknown

Question

Hello all,

I'm using FreeTDS driver for connecting to MSSQL server. I'm getting this error when trying to insert a new row into one of the tables.

Can't insert new ABC::XYZ : DBD::FreeTDS::st execute failed: Server message number=8009 severity=16 state=1 line=1 server=SERVERNAME text=The incoming tabular data stream (TDS) remote procedure call (RPC) protocol stream is incorrect. Parameter 4 (""): Data type 0xFF is unknown. [for Statement "INSERT INTO mytable (name, id, something, foreign_id) VALUES (?, ?, ?, ?) SELECT @@IDENTITY .. ..

Any idea what could be wrong. I'm trying to insert a bunch of rows into the table one by one through a script. Some rows get inserted and after that I get this error. Surprisingly this happens for different rows at different times.

Thanks