vscode extension: Request textDocument/documentHighlight failed

[Error - 11:17:27 AM] Request textDocument/documentHighlight failed.
Message: Internal error.
Code: -32603
java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot invoke "com.garmin.monkeybrains.compiler2.ir.namespace.Namespace.find(com.garmin.monkeybrains.compiler2.ir.namespace.NamespaceId)" because "namespace" is null
at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315)
at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1770)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1760)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
Caused by: java.lang.NullPointerException: Cannot invoke "com.garmin.monkeybrains.compiler2.ir.namespace.Namespace.find(com.garmin.monkeybrains.compiler2.ir.namespace.NamespaceId)" because "namespace" is null
at com.garmin.monkeybrains.languageserver.requests.ReferenceContext.getClassHierarchyFuncsToRename(ReferenceContext.java:292)
at com.garmin.monkeybrains.languageserver.requests.ReferenceContext.buildMonkeyCReferences(ReferenceContext.java:245)
at com.garmin.monkeybrains.languageserver.requests.ReferenceContext.buildReferences(ReferenceContext.java:186)
at com.garmin.monkeybrains.languageserver.requests.ReferenceContext.<init>(ReferenceContext.java:92)
at com.garmin.monkeybrains.languageserver.requests.ContextBuilder.buildReferenceContext(ContextBuilder.java:327)
at com.garmin.monkeybrains.languageserver.requests.ContextBuilder.buildReferenceContext(ContextBuilder.java:188)
at com.garmin.monkeybrains.languageserver.MonkeyCTextDocumentService.lambda$documentHighlight$6(MonkeyCTextDocumentService.java:306)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768)
... 6 more

[Info - 11:18:02 AM] Received textDocument/hover request for URI 'file:/HikerDF/source/HikerDFView.mc'.
[Info - 11:18:02 AM] Found workspace with root folder 'Hiker/HikerDF' for file 'HikerDF/source/HikerDFView.mc'.
[Error - 11:18:02 AM] Unable to find symbol in file 'HikerDF/source/HikerDFView.mc'.