NullPointerException when site URL is not defined in distributionManagement

<distributionManagement>
  <site>
    <id>alfresco.website</id>
  </site>
</distributionManagement>

[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-site-plugin:3.0:site (default-site) on project alfresco: Execution default-site of goal org.apache.maven.plugins:maven-site-plugin:3.0:site failed. NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-site-plugin:3.0:site (default-site) on project alfresco: Execution default-site of goal org.apache.maven.plugins:maven-site-plugin:3.0:site failed.
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-site of goal org.apache.maven.plugins:maven-site-plugin:3.0:site failed.
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:110)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        ... 19 more
Caused by: java.lang.NullPointerException
        at java.io.File.<init>(File.java:222)
        at org.apache.maven.doxia.tools.DefaultSiteTool.urlEncode(DefaultSiteTool.java:1478)
        at org.apache.maven.doxia.tools.DefaultSiteTool.getDistMgmntSiteUrl(DefaultSiteTool.java:1451)
        at org.apache.maven.doxia.tools.DefaultSiteTool.appendMenuItem(DefaultSiteTool.java:1380)
        at org.apache.maven.doxia.tools.DefaultSiteTool.populateModulesMenuItemsFromModels(DefaultSiteTool.java:1344)
        at org.apache.maven.doxia.tools.DefaultSiteTool.populateModulesMenu(DefaultSiteTool.java:905)
        at org.apache.maven.doxia.tools.DefaultSiteTool.getDecorationModel(DefaultSiteTool.java:488)
        at org.apache.maven.plugins.site.AbstractSiteRenderingMojo.createSiteRenderingContext(AbstractSiteRenderingMojo.java:286)
        at org.apache.maven.plugins.site.SiteMojo.renderLocale(SiteMojo.java:154)
        at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:138)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)