Exception happened during file editing

[nduriez]

I got an Exception when writing "..." in an instruction, here's the StrackTrace:

java.lang.IllegalStateException: element.parent.prevSibling.prevSibling.lastChild must not be null at com.github.kornilova203.matlab.completion.MatlabLibraryFunctionCompletionContributor$1.addCompletions(MatlabLibraryFunctionCompletionContributor.kt:44) at com.intellij.codeInsight.completion.CompletionProvider.addCompletionVariants(CompletionProvider.java:34) at com.intellij.codeInsight.completion.CompletionContributor.fillCompletionVariants(CompletionContributor.java:156) at com.intellij.codeInsight.completion.CompletionService.getVariantsFromContributors(CompletionService.java:77) at com.intellij.codeInsight.completion.CompletionResultSet.runRemainingContributors(CompletionResultSet.java:154) at com.intellij.codeInsight.completion.CompletionResultSet.runRemainingContributors(CompletionResultSet.java:146) at com.intellij.codeInsight.completion.CompletionResultSet.runRemainingContributors(CompletionResultSet.java:142) at com.intellij.codeInsight.template.impl.LiveTemplateCompletionContributor$1.addCompletions(LiveTemplateCompletionContributor.java:89) at com.intellij.codeInsight.completion.CompletionProvider.addCompletionVariants(CompletionProvider.java:34) at com.intellij.codeInsight.completion.CompletionContributor.fillCompletionVariants(CompletionContributor.java:156) at com.intellij.codeInsight.completion.CompletionService.getVariantsFromContributors(CompletionService.java:77) at com.intellij.codeInsight.completion.CompletionService.getVariantsFromContributors(CompletionService.java:60) at com.intellij.codeInsight.completion.CompletionService.performCompletion(CompletionService.java:133) at com.intellij.codeInsight.completion.BaseCompletionService.performCompletion(BaseCompletionService.java:41) at com.intellij.codeInsight.completion.CompletionProgressIndicator.lambda$calculateItems$12(CompletionProgressIndicator.java:863) at com.intellij.util.indexing.FileBasedIndex.lambda$ignoreDumbMode$0(FileBasedIndex.java:163) at com.intellij.openapi.util.RecursionManager$1.computePreventingRecursion(RecursionManager.java:111) at com.intellij.util.indexing.FileBasedIndexEx.ignoreDumbMode(FileBasedIndexEx.java:574) at com.intellij.util.indexing.FileBasedIndex.ignoreDumbMode(FileBasedIndex.java:162) at com.intellij.util.indexing.DumbModeAccessType.ignoreDumbMode(DumbModeAccessType.java:43) at com.intellij.codeInsight.completion.CompletionProgressIndicator.calculateItems(CompletionProgressIndicator.java:859) at com.intellij.codeInsight.completion.CompletionProgressIndicator.runContributors(CompletionProgressIndicator.java:847) at com.intellij.codeInsight.completion.CodeCompletionHandlerBase.lambda$startContributorThread$6(CodeCompletionHandlerBase.java:353) at com.intellij.codeInsight.completion.AsyncCompletion.lambda$tryReadOrCancel$5(CompletionThreading.java:172) at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1096) at com.intellij.codeInsight.completion.AsyncCompletion.tryReadOrCancel(CompletionThreading.java:170) at com.intellij.codeInsight.completion.CodeCompletionHandlerBase.lambda$startContributorThread$7(CodeCompletionHandlerBase.java:345) at com.intellij.codeInsight.completion.AsyncCompletion.lambda$startThread$0(CompletionThreading.java:95) at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:178) at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:688) at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:634) at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:64) at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:165) at com.intellij.codeInsight.completion.AsyncCompletion.lambda$startThread$1(CompletionThreading.java:91) at com.intellij.util.RunnableCallable.call(RunnableCallable.java:20) at com.intellij.util.RunnableCallable.call(RunnableCallable.java:11) at com.intellij.openapi.application.impl.ApplicationImpl$1.call(ApplicationImpl.java:265) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668) at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665) at java.base/java.lang.Thread.run(Thread.java:834)