Error inserting blob into proxy table

Hello, I am trying to insert some images from one table to another
proxy table, both have identical structure, and I keep getting this
error:

Msg 7133, Level 16, State 3: Server 'pptci', Line 1: NULL textptr
passed to WRITETEXT function.


I cannot find where the problem is.  I'm using 12.5.4


Help!

Thanks,