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java.lang.NullPointerException: 	at org.sonar.css.checks.BulletproofFontFace.visitNode(BulletproofFontFace.java:67)	at com.sonar.sslr.impl.ast.AstWalker.visitNode(AstWalker.java:114)	at com.sonar.sslr.impl.ast.AstWalker.visit(AstWalker.java:85)	at com.sonar.sslr.impl.ast.AstWalker.visitChildren(AstWalker.java:99)	at com.sonar.sslr.impl.ast.AstWalker.visit(AstWalker.java:87)	at com.sonar.sslr.impl.ast.AstWalker.visitChildren(AstWalker.java:99)	at com.sonar.sslr.impl.ast.AstWalker.visit(AstWalker.java:87)	at com.sonar.sslr.impl.ast.AstWalker.walkAndVisit(AstWalker.java:69)	at org.sonar.squidbridge.AstScanner.scanFiles(AstScanner.java:106)	at org.sonar.plugins.css.CssSquidSensor.analyse(CssSquidSensor.java:91)	at org.sonar.batch.phases.SensorsExecutor.executeSensor(SensorsExecutor.java:59)	at org.sonar.batch.phases.SensorsExecutor.execute(SensorsExecutor.java:51)	at org.sonar.batch.phases.DatabaseModePhaseExecutor.execute(DatabaseModePhaseExecutor.java:120)	at org.sonar.batch.scan.ModuleScanContainer.doAfterStart(ModuleScanContainer.java:264)	at org.sonar.api.platform.ComponentContainer.startComponents(ComponentContainer.java:92)	at org.sonar.api.platform.ComponentContainer.execute(ComponentContainer.java:77)	at org.sonar.batch.scan.ProjectScanContainer.scan(ProjectScanContainer.java:235)	at org.sonar.batch.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:230)	at org.sonar.batch.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:228)	at org.sonar.batch.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:220)	at org.sonar.api.platform.ComponentContainer.startComponents(ComponentContainer.java:92)	at org.sonar.api.platform.ComponentContainer.execute(ComponentContainer.java:77)	at org.sonar.batch.scan.ScanTask.scan(ScanTask.java:57)	at org.sonar.batch.scan.ScanTask.execute(ScanTask.java:45)	at org.sonar.batch.bootstrap.TaskContainer.doAfterStart(TaskContainer.java:135)	at org.sonar.api.platform.ComponentContainer.startComponents(ComponentContainer.java:92)	at org.sonar.api.platform.ComponentContainer.execute(ComponentContainer.java:77)	at org.sonar.batch.bootstrap.GlobalContainer.executeTask(GlobalContainer.java:158)	at org.sonar.batch.bootstrapper.Batch.executeTask(Batch.java:95)	at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:67)	at org.sonar.runner.batch.IsolatedLauncher.execute(IsolatedLauncher.java:48)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.sonar.runner.impl.BatchLauncher$1.delegateExecution(BatchLauncher.java:87)	at org.sonar.runner.impl.BatchLauncher$1.run(BatchLauncher.java:75)	at java.security.AccessController.doPrivileged(Native Method)	at org.sonar.runner.impl.BatchLauncher.doExecute(BatchLauncher.java:69)	at org.sonar.runner.impl.BatchLauncher.execute(BatchLauncher.java:50)	at org.sonar.runner.api.EmbeddedRunner.doExecute(EmbeddedRunner.java:102)	at org.sonar.runner.api.Runner.execute(Runner.java:100)	at org.sonar.runner.Main.executeTask(Main.java:70)	at org.sonar.runner.Main.execute(Main.java:59)	at org.sonar.runner.Main.main(Main.java:53)