Problem with uptade on SQLlite

[info26]

In my applycation to modify a record i use sql statment UPDATE table, SET.... WHERE ID="myid"

when I testing my application in LiveCode or in iPhone Simulator all is OK, when I test the application on a real iPhone sometimes save two records with the equal ID (which it should be unique).

Have you some suggestions?

Livecode 4.6.4

Thank's

Mimmo