TclDBI

When there are obtained data of an unknown type, then
NULL is put into Tcl_ListObjAppendElement(). It results
in segmentation fault. Example:

package require Tcldbi
set db [dbi::dbi new sqlite dbname test.db sqlite_dbdir
/a_dir]
set cur [$db query {SELECT * FROM test}]
puts [$cur first_row]
---segmentation fault---

It is so because one column in table "test" is DATE.
While SQLite is typeless, it allows to create tables
with DATE attribute.