Dependency report breaks on systemPath artifacts

My project refers to several artifacts that have a <systemPath> element, refering to jar files in the ${basedir}/lib directory. The projects builds fine, but the dependency reports breaks when it starts processing these dependencies.

java.lang.NullPointerException
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:82)
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:63)
at org.apache.maven.project.DefaultMavenProjectBuilder.findModelFromRepository(DefaultMavenProjectBuilder.java:380)
at org.apache.maven.project.DefaultMavenProjectBuilder.buildFromRepository(DefaultMavenProjectBuilder.java:346)
at org.apache.maven.report.projectinfo.DependenciesReport$DependenciesRenderer.getMavenProjectFromRepository(DependenciesReport.java:362)
at org.apache.maven.report.projectinfo.DependenciesReport$DependenciesRenderer.renderBody(DependenciesReport.java:242)
at org.apache.maven.reporting.AbstractMavenReportRenderer.render(AbstractMavenReportRenderer.java:65)
at org.apache.maven.report.projectinfo.DependenciesReport.executeReport(DependenciesReport.java:157)
at org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:98)
at org.apache.maven.plugins.site.SiteMojo.generateReportsPages(SiteMojo.java:789)
at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:301)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:399)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:519)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:482)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:452)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:301)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:268)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:137)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:316)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:113)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:249)
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:324)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)