Hi Marcus,

>
> Please test....
>
>      http://ftp.squeak.org/3.9beta/Squeak3.9b-7051.zip
>
>

    I was trying to open SqueakMap Package Loader,
    and got this MNU :

UndefinedObject(Object)>>doesNotUnderstand: #select:
 Receiver: nil
 Arguments and temporary variables: 
  aMessage:  select: [] in SMSqueakMap>>categories {[:o | o isCategory]}
 Receiver's instance variables: 
nil

    Please find attached SqueakDebug.zip

    Cheers,

    SmallSqueak.
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