Opening two of the same wallet (tested in v0.18.0 of bitcoin-qt 64 bit) will cause a database collision, and will crash the program.

`[marshall@likon] {21:21} [~] $ bitcoin-0.18.0/bin/bitcoin-qt `
`terminate called after throwing an instance of 'std::runtime_error'  what():  BerkeleyBatch: Can't open database 8204388-wallet.dat (duplicates fileid 8b1c090000000800e25686350000000000000000 from 1352491-wallet.dat)`
`Aborted (core dumped)`

I have been able to reproduce the issue by importing two of the same wallet (with different filenames).
} else { 
                
                
                
                
                
                
                
                if (!CanGetAddresses(true)) {
                    strFailReason = _("Can't generate a change-address key. No keys in the internal keypool and can't generate any keys.").translated;
                    return false;
                }
                CTxDestination dest;
                bool ret = reservedest.GetReservedDestination(dest, true);
                if (!ret)
                {
                    strFailReason = "Keypool ran out, please call keypoolrefill first";
                    return false;
                }
                scriptChange = GetScriptForDestination(dest);
            }
            CTxOut change_prototype_txout(0, scriptChange);
            coin_selection_params.change_output_size = GetSerializeSize(change_prototype_txout);
            CFeeRate discard_rate = GetDiscardRate(*this);
            
            CFeeRate nFeeRateNeeded = GetMinimumFeeRate(*this, coin_control, &feeCalc);
            nFeeRet = 0;
            bool pick_new_inputs = true;
            CAmount nValueIn = 0;