NullPointException when running sonar-scanner with sbt-sonar

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NullPointException when running sonar-scanner

When running sonar-scanner to generate Sonar report, got the following exception

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10:20:35.931 ERROR: Error during SonarQube Scanner execution
java.lang.NullPointerException
	at org.sonarsource.scm.git.GitScmProviderBefore77.revisionId(GitScmProviderBefore77.java:173)
	at org.sonar.scanner.scm.ScmRevisionImpl.get(ScmRevisionImpl.java:62)
	at org.sonar.scanner.report.MetadataPublisher.addScmInformation(MetadataPublisher.java:153)
	at org.sonar.scanner.report.MetadataPublisher.publish(MetadataPublisher.java:105)
	at org.sonar.scanner.report.ReportPublisher.generateReportFile(ReportPublisher.java:152)
	at org.sonar.scanner.report.ReportPublisher.execute(ReportPublisher.java:138)
	at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:366)
	at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136)
	at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122)
	at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart(GlobalContainer.java:141)
	at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136)
	at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122)
	at org.sonar.batch.bootstrapper.Batch.doExecute(Batch.java:73)
	at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:67)
	at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute(BatchIsolatedLauncher.java:46)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60)
	at com.sun.proxy.$Proxy0.execute(Unknown Source)
	at org.sonarsource.scanner.api.EmbeddedScanner.doExecute(EmbeddedScanner.java:185)
	at org.sonarsource.scanner.api.EmbeddedScanner.execute(EmbeddedScanner.java:137)
	at org.sonarsource.scanner.cli.Main.execute(Main.java:112)
	at org.sonarsource.scanner.cli.Main.execute(Main.java:75)
	at org.sonarsource.scanner.cli.Main.main(Main.java:61)

Root cause

Need to commit the code before run the sonar-scanner command.

Alternatively, if there is no HEAD, just specify -Dsonar.scm.disabled=true.

Reference

https://community.sonarsource.com/t/nullpointerexception-when-running-scan/15598