[Libreoffice-bugs] [Bug 126828] New: Variables having assigned objects from closed components pretend to still be valid. Attempts to inspect them in the IDE cause crashes.

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=126828

            Bug ID: 126828
           Summary: Variables having assigned objects from closed
                    components pretend to still be valid. Attempts to
                    inspect them in the IDE cause crashes.
           Product: LibreOffice
           Version: 6.3.0.2 rc
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: BASIC
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: jag at psilosoph.de

Created attachment 153299
  --> https://bugs.documentfoundation.org/attachment.cgi?id=153299&action=edit
The announced attachment. Contains macro!

(See also code below.)
A variable got assigned a component, another one an object emerging from that
component. The component then was closed (doc.Close(True)).

Expectations:
Closing a document component should remove any non-Null assignment from
variables previously giving access to it or to an object having emerged from
that component.
The variables should best get assigned the 'Null' value.

Actual behaviour:
After closing the document component, the IDE still shows the mentioned
variables as if they still give access to the dead document and to the other
object.
Special aggravation:
An attempt to inspect one of the phantom objects results in a complete crash of
LibreOffice.

Experience and tests with LibO V 6.3.0.2RC under Win 10 newest version as of
2019-08-10.
MS Windows(TM) Version 1903 (Build 18362.267)
"1903" should probably read "2019-03", but wisely MS indicates the corporation
won't live to see the next century.

Code:
Sub test
Dim nullOb As Object REM Usage see below!
Dim doc As Object, Sheet As Object
doc   = StarDesktop.loadComponentFromUrl("private:factory/scalc", "_blank", 0,
Array())
sheet = doc.Sheets(0)
doc.Close(True)
h1    = doc    REM Assignment as if doc still is accessible!
h2    = sheet  REM Assignment as if sheet still is accessible!
REM The following would help to avoid the crash.
doc   = nullOb
sheet = nullOb
End Sub

For more details see attachment.

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