When indexing a specific chm file: System.ArgumentException: Path can't be null or empty string

We are getting the following error event via index.Events.ErrorOccurred += ... when we try to index a folder with a specific chm file:

System.ArgumentException: Path can't be null or empty string
   at .(String )
   at e.e          ​    ()
   at .ReadLine()
   at .ReadLine()
   at .()
   at .()
   at .(Cancellation )
   at .( )
   at .( )
   at .(Document ,  , String )

This ZIP file contains the problematic chm file:

NppExec_Manual.zip (45.4 KB)

@jamsharp
We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.

Issue ID(s): SEARCHNET-3327

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