Unable to analyze Java files in connected mode with SonarJava < 5.12

Analysing 'ClirrSensor.java'...
Starting analysis with configuration:
[
  projectKey: org.sonarsource.clirr:sonar-clirr-plugin
  baseDir: C:\Prog\Projects\sonar-clirr
  inputFiles: [
    file://C:/Prog/Projects/sonar-clirr/src/main/java/org/sonar/plugins/clirr/ClirrSensor.java (UTF-8)
  ]
]

Available languages:
  * Java => "java"
Start analysis
Declared extensions of language Java were converted to java: **/*.java,**/*.jav
Index files
Language of file 'file://C:/Prog/Projects/sonar-clirr/src/main/java/org/sonar/plugins/clirr/ClirrSensor.java' is detected to be 'java'
1 file indexed
Quality profiles:
  * java: 'Sonar way' (324 rules)
Execute Sensor: JavaSquidSensor
Configured Java source version (sonar.java.source): 7
JavaClasspath initialization
JavaClasspath initialization (done) | time=34ms
JavaTestClasspath initialization
JavaTestClasspath initialization (done) | time=23ms
[...]
-----
Java Main Files AST scan
1 source files to be analyzed
Error running SonarLint analysis
org.sonar.java.AnalysisException: SonarQube is unable to analyze file : 'C:\Prog\Projects\sonar-clirr\src\main\java\org\sonar\plugins\clirr\ClirrSensor.java'
	at org.sonar.java.ast.JavaAstScanner.simpleScan(JavaAstScanner.java:105)
	at org.sonar.java.ast.JavaAstScanner.scan(JavaAstScanner.java:68)
	at org.sonar.java.JavaSquid.scanSources(JavaSquid.java:116)
	at org.sonar.java.JavaSquid.scan(JavaSquid.java:110)
	at org.sonar.plugins.java.JavaSquidSensor.execute(JavaSquidSensor.java:93)
	at org.sonarsource.sonarlint.core.analyzer.sensor.SensorsExecutor.executeSensor(SensorsExecutor.java:80)
	at org.sonarsource.sonarlint.core.analyzer.sensor.SensorsExecutor.execute(SensorsExecutor.java:71)
	at org.sonarsource.sonarlint.core.container.analysis.AnalysisContainer.doAfterStart(AnalysisContainer.java:134)
	at org.sonarsource.sonarlint.core.container.ComponentContainer.startComponents(ComponentContainer.java:125)
	at org.sonarsource.sonarlint.core.container.ComponentContainer.execute(ComponentContainer.java:110)
	at org.sonarsource.sonarlint.core.container.storage.StorageAnalyzer.analyze(StorageAnalyzer.java:75)
	at org.sonarsource.sonarlint.core.container.storage.StorageContainerHandler.analyze(StorageContainerHandler.java:81)
	at org.sonarsource.sonarlint.core.ConnectedSonarLintEngineImpl.lambda$analyze$0(ConnectedSonarLintEngineImpl.java:152)
	at org.sonarsource.sonarlint.core.ConnectedSonarLintEngineImpl.withReadLock(ConnectedSonarLintEngineImpl.java:344)
	at org.sonarsource.sonarlint.core.ConnectedSonarLintEngineImpl.withReadLock(ConnectedSonarLintEngineImpl.java:334)
	at org.sonarsource.sonarlint.core.ConnectedSonarLintEngineImpl.analyze(ConnectedSonarLintEngineImpl.java:149)
	at org.sonarlint.intellij.core.ConnectedSonarLintFacade.analyze(ConnectedSonarLintFacade.java:74)
	at org.sonarlint.intellij.core.SonarLintFacade.startAnalysis(SonarLintFacade.java:63)
	at org.sonarlint.intellij.analysis.SonarLintAnalyzer.analyzeModule(SonarLintAnalyzer.java:97)
	at org.sonarlint.intellij.analysis.SonarLintTask.analyze(SonarLintTask.java:187)
	at org.sonarlint.intellij.analysis.SonarLintTask.run(SonarLintTask.java:109)
	at org.sonarlint.intellij.analysis.SonarLintJobManager.lambda$runTask$1(SonarLintJobManager.java:120)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:169)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:591)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:537)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:59)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:156)
	at org.sonarlint.intellij.analysis.SonarLintJobManager.lambda$runTask$2(SonarLintJobManager.java:120)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.NullPointerException
	at org.sonar.java.SonarComponents.fileContent(SonarComponents.java:298)
	at org.sonar.java.ast.JavaAstScanner.getFileContent(JavaAstScanner.java:116)
	at org.sonar.java.ast.JavaAstScanner.simpleScan(JavaAstScanner.java:89)
	... 32 more