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java.lang.NullPointerException: 	at org.elixir_lang.psi.scope.call_definition_clause.Variants.getLookupElementCollection(Variants.java:144)	at org.elixir_lang.psi.scope.call_definition_clause.Variants.lookupElementList(Variants.java:42)	at org.elixir_lang.reference.Callable.getVariants(Callable.java:583)	at com.intellij.codeInsight.completion.CompletionData.completeReference(CompletionData.java:313)	at com.intellij.codeInsight.completion.CompletionVariant.addReferenceCompletions(CompletionVariant.java:181)	at com.intellij.codeInsight.completion.CompletionData.completeReference(CompletionData.java:112)	at com.intellij.codeInsight.completion.LegacyCompletionContributor$1.consume(LegacyCompletionContributor.java:73)	at com.intellij.codeInsight.completion.LegacyCompletionContributor$1.consume(LegacyCompletionContributor.java:69)	at com.intellij.codeInsight.completion.LegacyCompletionContributor.processReference(LegacyCompletionContributor.java:124)	at com.intellij.codeInsight.completion.LegacyCompletionContributor.processReferences(LegacyCompletionContributor.java:107)	at com.intellij.codeInsight.completion.LegacyCompletionContributor.completeReference(LegacyCompletionContributor.java:69)	at com.intellij.codeInsight.completion.LegacyCompletionContributor.fillCompletionVariants(LegacyCompletionContributor.java:52)	at com.intellij.codeInsight.completion.CompletionService.getVariantsFromContributors(CompletionService.java:81)	at com.intellij.codeInsight.completion.CompletionResultSet.runRemainingContributors(CompletionResultSet.java:135)	at com.intellij.codeInsight.completion.CompletionResultSet.runRemainingContributors(CompletionResultSet.java:128)	at com.intellij.codeInsight.template.impl.LiveTemplateCompletionContributor$2.addCompletions(LiveTemplateCompletionContributor.java:90)	at com.intellij.codeInsight.completion.CompletionProvider.addCompletionVariants(CompletionProvider.java:36)	at com.intellij.codeInsight.completion.CompletionContributor.fillCompletionVariants(CompletionContributor.java:155)	at com.intellij.codeInsight.completion.CompletionService.getVariantsFromContributors(CompletionService.java:81)	at com.intellij.codeInsight.completion.CompletionService.performCompletion(CompletionService.java:112)	at com.intellij.codeInsight.completion.CompletionProgressIndicator.calculateItems(CompletionProgressIndicator.java:796)	at com.intellij.codeInsight.completion.CompletionProgressIndicator.access$1000(CompletionProgressIndicator.java:90)	at com.intellij.codeInsight.completion.CompletionProgressIndicator$1CalculateItems.run(CompletionProgressIndicator.java:778)	at com.intellij.codeInsight.completion.AsyncCompletion$1$1$1.run(CompletionThreading.java:93)	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:872)	at com.intellij.codeInsight.completion.AsyncCompletion$1$1.run(CompletionThreading.java:88)	at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:152)	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:452)	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:402)	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:137)	at com.intellij.codeInsight.completion.AsyncCompletion$1.run(CompletionThreading.java:84)	at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:400)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)	at java.lang.Thread.run(Thread.java:695)	at org.jetbrains.ide.PooledThreadExecutor$1$1.run(PooledThreadExecutor.java:56)