Content Assist: error while query symbols in unloaded modules

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Version: DDT - D Development Tools 0.11.0.v201503062245

If you call completion on symbols in another module and the modules haven't been opened at least once in editor before, you get the following error:

Last exception in log:

!ENTRY org.dsource.ddt.ide.core 4 0 2015-03-07 12:46:20.846
!MESSAGE Internal Error
!STACK 0
AssertFailedException
    at melnorme.utilbox.core.Assert$AssertHandler.handleAssert(Assert.java:60)
    at melnorme.utilbox.core.Assert.checkAssertion(Assert.java:87)
    at melnorme.utilbox.core.Assert$AssertNamespace.assertTrue(Assert.java:149)
    at melnorme.lang.tooling.ast.ASTNodeFinder.<init>(ASTNodeFinder.java:53)
    at melnorme.lang.tooling.ast.ASTNodeFinder.<init>(ASTNodeFinder.java:42)
    at dtool.engine.operations.FindDefinitionOperation.findDefinition(FindDefinitionOperation.java:65)
    at dtool.engine.operations.FindDefinitionOperation.findDefinition(FindDefinitionOperation.java:60)
    at dtool.engine.DToolServer.doFindDefinition(DToolServer.java:92)
    at mmrnmhrm.core.engine_client.DToolClient.doFindDefinition(DToolClient.java:265)
    at mmrnmhrm.core.engine_client.DToolClient$FindDefinitionOperation.doRunOperationWithWorkingCopy(DToolClient.java:234)
    at mmrnmhrm.core.engine_client.DToolClient$FindDefinitionOperation.doRunOperationWithWorkingCopy(DToolClient.java:1)
    at mmrnmhrm.core.engine_client.AbstractSemanticDaemonClient$SemanticEngineOperation.runOperationWithWorkingCopy(AbstractSemanticDaemonClient.java:168)
    at mmrnmhrm.core.engine_client.AbstractSemanticDaemonClient$WorkingCopyOperation.runSemanticServerOperation(AbstractSemanticDaemonClient.java:141)
    at mmrnmhrm.ui.actions.DeeOpenDefinitionOperation.performLongRunningComputation_do(DeeOpenDefinitionOperation.java:60)
    at melnorme.lang.ide.ui.actions.AbstractUIOperation.performLongRunningComputation_inWorkerThread(AbstractUIOperation.java:125)
    at melnorme.lang.ide.ui.actions.AbstractUIOperation$1.run(AbstractUIOperation.java:101)
    at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:122)

P.S. I recreated project after updating

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Another way to reproduce: type this. (anywhere in block), ignore completion dialog, start pressing backspace until there are only two letters th, exception raised.

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#99 has instruction for temporary workaround how to downgrade to 10th version