并发数默认或设置成1，运行后都报错无效的内存地址或... #1

报错如下：
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x8 pc=0x45cd54]

goroutine 148 [running]:
sshpro/utils/root.Connection.OutPut.func3(0xc000212190, 0x52f0028, 0xc0003523a0,
0xc000356330)
/usr/local/go/src/sshpro/utils/root/connect.go:92 +0xc6
created by sshpro/utils/root.Connection.OutPut
/usr/local/go/src/sshpro/utils/root/connect.go:88 +0x3b1