[Solved] Golang invalid argument to intn error solution

A problem background

In recent projects, random numbers are used to deal with random problems. During the testing process, the project suddenly reported an error: invalid argument to intn; the prompt is as follows:

The second reason for the problem

The random function I use here is the golang built-in package rand, the method used is rand.Intn, the input parameter of this method is a non-negative number; then the return value is The random number between [0,n); when I use it here, I do not judge the input parameter n, in some cases, the input parameter n will become 0, which is why the above error is reported: invalid argument to intn
In fact, this error is a prompt in the source code implementation of the random function; when the incoming parameter is less than or equal to 0, this prompt will be thrown; the example demo is as follows:

package main

import (
"fmt"
"math/rand"