[sqlite] Problem with DETACH on 2.8.16

[Laurent]

Hello,

I'm using sqlite 2.8.16.
I have 2 databases, x1.dbx and x2.dbx, created with the same commands: 

  create table documents (a);
  create index i on documents(a);

Then, if I run :

  attach 'x1.dbx' as d1; 
  attach 'x2.dbx' as d2;
  detach d1;

I get the error :

   Assertion failed: xHash!=0, file hash.c, line 299
   Abnormal program termination

This error will occur using the command line (under Windows) or the DLL.

Could you please check.  
Thanks in advance.

Laurent.