Error using SQLite ATTACH - DETACH in Delphi

L.S.,

I experience a, for me unsolvable, problem with ATTACH and DETACH in SQLite, using Delphi (Firedac).

I have one database file connected and attach a second one with: FDConnection1.ExecSQL('ATTACH DATABASE "' + Import_DB_filename + '" AS IMPORTDB;'); Therein, the variable "Import_DB_filename" contains the full path and filename of the database file.

This works OK and I can access both databases within the connection through the FireDac queries, and can do my coding without problems. However, things go wrong upon detaching: FDConnection1.ExecSQL('DETACH DATABASE IMPORTDB;');

In debugging mode, I always get the error:

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Debugger Exception Notification

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E Project My_Program.EXE raised exception class $C0000005 with message 'access violation at 0x00405d7b: read of address 0x00000000'.

Apparently something goes wrong with the memory assignments, since the debugger stops in a (assemly) function "SysFreeMem(P:Pointer): Integer;" in "GETMEM.INC".

Whatever I try, the error persists and associates a memory leak that eventually leads to a crash of the compiler (Delphi Seattle Enterprise).

Even attaching and subsequent detaching of the database without passing any code results in the same error.

(FDconnection: locking mode = lmNormal; JournalMode = jmOff or jmWALL or jmdelete)

I do hope that you can help me out on this lasting problem. May thanks ahead.

JGMS