General SQL Error, MS-SQL, Please.....

I have terrible problem.
Delphi3 c/s suite,  MS-SQL Server, BDE4.0
My Project uses about 20 tables with TTable, not TQuery.
When post table (TTable.Post), in some cases - not often, following error
General SQL error.
Line 1: Incorrect syntax near '31'.
Unclosed quote before the character string ')'.

I never used TQuery (Passthrough SQL), using only TTable.
In what case this error occurs?
How can I fix this problems?
help me please!!!!!!!!!!!!!