with disconnect

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ba4852 in pqxx::connection_base::is_open() const () from /usr/lib/libpqxx-3.1.so
(gdb) bt
#0  0x00007ffff7ba4852 in pqxx::connection_base::is_open() const () from /usr/lib/libpqxx-3.1.so
#1  0x00000000004019d3 in PGConnection::disconnect (this=0x7fffffffe600) at pgconnection.cpp:42
#2  0x000000000040269e in main () at main.cpp:8
(gdb) frame 2
#2  0x000000000040269e in main () at main.cpp:8
8       pgConn.disconnect();
(gdb) print pgConn
$1 = {conn = 0x3}