Gist for the code used to reproduce the skip exception's throwable missing in ITestResult

build.gradle

plugins {
    id 'java'
}

group 'org.example'
version '1.0-SNAPSHOT'

sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

ext.libraries = [
        // Testing Framework
        testng            : 'org.testng:testng:7.4.0',

        //For Browsers and Devices
        selenium          : 'org.seleniumhq.selenium:selenium-java:4.0.0-beta-1',
        webdrivermanager  : 'io.github.bonigarcia:webdrivermanager:4.0.0'
]

dependencies {
    testCompile libraries.testng
    testCompile libraries.selenium
    testCompile libraries.webdrivermanager
}

test {
    testLogging {
        exceptionFormat = 'full'
        events "STARTED", "PASSED", "FAILED", "SKIPPED"
    }

    useTestNG {

    }
}

TestNGSeleniumSkipTest.java

package com.sample.tests;

import io.github.bonigarcia.wdm.WebDriverManager;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.edge.EdgeDriver;
import org.openqa.selenium.edge.EdgeOptions;
import org.testng.ITestResult;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

public class TestNGSeleniumSkipTest {

    WebDriver driver;

    @BeforeMethod(alwaysRun = true)
    public void init() {
        WebDriverManager.edgedriver().setup();
        driver = new EdgeDriver(new EdgeOptions());
        driver.get(""); // Marked intentionally in order to skip the test
    }

    @Test(testName = "Sample Test")
    public void sampleTestOne() {
        System.out.println(driver.getCurrentUrl());
    }

    @AfterMethod(alwaysRun = true)
    public void teardown(ITestResult result) {
        System.out.println(result.getThrowable().getMessage()); // LoC where I get a NullPointerException
        driver.quit();
    }

}