Fixing NPE

java.lang.NullPointerException
	at com.github.kumaraman21.intellijbehave.highlighter.StoryLocalizedLexer.tokenType(StoryLocalizedLexer.java:427)
	at com.github.kumaraman21.intellijbehave.highlighter.StoryLocalizedLexer.locateToken(StoryLocalizedLexer.java:168)
	at com.github.kumaraman21.intellijbehave.highlighter.StoryLocalizedLexer.advanceIfRequired(StoryLocalizedLexer.java:114)
	at com.github.kumaraman21.intellijbehave.highlighter.StoryLocalizedLexer.getTokenType(StoryLocalizedLexer.java:80)
	at com.intellij.lang.impl.PsiBuilderImpl.a(PsiBuilderImpl.java:209)
	at com.intellij.lang.impl.PsiBuilderImpl.<init>(PsiBuilderImpl.java:177)
	at com.intellij.lang.impl.PsiBuilderImpl.<init>(PsiBuilderImpl.java:151)
	at com.intellij.lang.impl.PsiBuilderImpl.<init>(PsiBuilderImpl.java:185)
	at com.intellij.lang.impl.PsiBuilderFactoryImpl.createBuilder(PsiBuilderFactoryImpl.java:52)
	at com.intellij.psi.tree.ILazyParseableElementType.doParseContents(ILazyParseableElementType.java:62)
	at com.intellij.psi.tree.IFileElementType.parseContents(IFileElementType.java:43)
	at com.intellij.psi.impl.source.tree.LazyParseableElement.e(LazyParseableElement.java:165)
	at com.intellij.psi.impl.source.tree.LazyParseableElement.getFirstChildNode(LazyParseableElement.java:209)
	at com.intellij.psi.impl.source.tree.CompositeElement.countChildren(CompositeElement.java:493)
	at com.intellij.psi.impl.source.tree.CompositeElement.getChildren(CompositeElement.java:438)
	at com.github.kumaraman21.intellijbehave.parser.StoryFileImpl.getStory(StoryFileImpl.java:72)
	at com.github.kumaraman21.intellijbehave.parser.StoryFileImpl.getScenarios(StoryFileImpl.java:62)
	at com.github.kumaraman21.intellijbehave.parser.StoryFileImpl.getSteps(StoryFileImpl.java:52)
	at com.github.kumaraman21.intellijbehave.codeInspector.UnusedStepsInspection$StepUsageFinder.processFile(UnusedStepsInspection.java:122)
	at com.intellij.openapi.vfs.VfsUtilCore$1.visitFileEx(VfsUtilCore.java:189)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:204)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:236)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:236)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:236)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:236)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:236)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:236)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:236)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:236)
	at com.intellij.openapi.vfs.VfsUtilCore.iterateChildrenRecursively(VfsUtilCore.java:184)
	at com.intellij.openapi.roots.impl.ProjectFileIndexImpl.iterateContent(ProjectFileIndexImpl.java:75)
	at com.github.kumaraman21.intellijbehave.codeInspector.UnusedStepsInspection$1.visitElement(UnusedStepsInspection.java:96)
	at com.intellij.psi.JavaElementVisitor.visitAnnotation(JavaElementVisitor.java:344)
	at com.intellij.psi.impl.source.tree.java.PsiAnnotationImpl.accept(PsiAnnotationImpl.java:102)
	at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.a(LocalInspectionsPass.java:412)
	at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.a(LocalInspectionsPass.java:370)
	at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.a(LocalInspectionsPass.java:341)
	at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.access$000(LocalInspectionsPass.java:78)
	at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass$2.process(LocalInspectionsPass.java:309)
	at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass$2.process(LocalInspectionsPass.java:306)
	at com.intellij.concurrency.JobLauncherImpl$2$1.run(JobLauncherImpl.java:115)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:226)
	at com.intellij.concurrency.JobLauncherImpl$2.process(JobLauncherImpl.java:113)
	at com.intellij.concurrency.JobLauncherImpl$1.run(JobLauncherImpl.java:54)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at com.intellij.concurrency.PrioritizedFutureTask.access$101(PrioritizedFutureTask.java:31)
	at com.intellij.concurrency.PrioritizedFutureTask$1.run(PrioritizedFutureTask.java:70)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1182)
	at com.intellij.concurrency.PrioritizedFutureTask.run(PrioritizedFutureTask.java:97)
	at com.intellij.concurrency.JobImpl.scheduleAndWaitForResults(JobImpl.java:136)
	at com.intellij.concurrency.JobLauncherImpl.a(JobLauncherImpl.java:68)
	at com.intellij.concurrency.JobLauncherImpl.invokeConcurrentlyUnderProgress(JobLauncherImpl.java:110)
	at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.a(LocalInspectionsPass.java:312)
	at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.a(LocalInspectionsPass.java:218)
	at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.collectInformationWithProgress(LocalInspectionsPass.java:136)
	at com.intellij.codeInsight.daemon.impl.ProgressableTextEditorHighlightingPass.doCollectInformation(ProgressableTextEditorHighlightingPass.java:58)
	at com.intellij.codeHighlighting.TextEditorHighlightingPass.collectInformation(TextEditorHighlightingPass.java:62)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass$1$1.run(PassExecutorService.java:357)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1182)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass$1.run(PassExecutorService.java:348)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:226)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.a(PassExecutorService.java:345)
	at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.run(PassExecutorService.java:321)
	at com.intellij.concurrency.JobLauncherImpl$3.call(JobLauncherImpl.java:145)
	at com.intellij.concurrency.JobLauncherImpl$3.call(JobLauncherImpl.java:142)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at com.intellij.concurrency.PrioritizedFutureTask.access$101(PrioritizedFutureTask.java:31)
	at com.intellij.concurrency.PrioritizedFutureTask$1.run(PrioritizedFutureTask.java:70)
	at com.intellij.concurrency.PrioritizedFutureTask.run(PrioritizedFutureTask.java:113)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:722)