0000634: Accessing member variable without valid object - MantisBT

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ID

Project

Category

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Date Submitted

Last Update

0000634

Zandronum

[All Projects] Bug

public

2011-12-14 16:34

2012-01-14 20:19

Reporter

Watermelon

Assigned To

Priority

high

Severity

crash

Reproducibility

random

Status

closed

Resolution

no change required

Platform

Microsoft

OS

Windows

OS Version

XP/Vista/7

Product Version

98d

Target Version

Fixed in Version

Summary

0000634: Accessing member variable without valid object

Description

The game seems to crash for everyone in the server with the error message "Accessing member variable without valid object".

In terms of recent patches, the only thing changed in the wad was using:

        for(int c = 0; c < 10; c++) {
            SetActorProperty(tid, APROP_Alpha, 0.9 - (0.1 * c));
            Delay(2);
        }
        SetActorProperty(tid, APROP_Alpha, 0); // Make sure its fully invisible

I had to add in SetActorProperty(tid, APROP_Alpha, 0); because the for loop would not set it totally invisible (it still had a value of 5 alpha (whatever that is in FP, 0.0001 probably) and since software could see it, i had to force the alpha to zero.

Since then, for no known reason the error message comes up with "Accessing member variable without valid object" and crashes everyone from the server. It's random, happens seldom-- but only started happening today and not for the past 4+ months that the wad has been up.

What causes this error message?
Could it be related to translucency at all? Or maybe it's something else entirely.
NOTE: It is not level dependent.
NOTE2: I'm checking to see if software has the same problems... we'll see if it occurs again and if so; i'll know if software was affected

Steps To Reproduce

N/A

Additional Information

Only place i could find similar code is from GZDoom's source:

SOURCE:
'http://mancubus.net/svn/hosted/gzdoom/trunk/src/thingdef/thingdef_expression.cpp [^]'

//==========================================================================
//
//
//
//==========================================================================

ExpVal FxClassMember::EvalExpression (AActor *self)
{
    char *object = NULL;
    if (classx->ValueType == VAL_Class)
    {
        // not implemented yet
    }
    else
    {
        object = classx->EvalExpression(self).GetPointer<char>();
    }
    if (object == NULL)
    {
        I_Error("Accessing member variable without valid object");
    }

    ExpVal ret;

    if (!AddressRequested)
    {
        ret = GetVariableValue(object + membervar->offset, membervar->ValueType);
    }
    else
    {
        ret.pointer = object + membervar->offset;
        ret.Type = VAL_Pointer;
    }
    return ret;
}

Relationships

Notes
(0002323) Watermelon (developer) 2011-12-14 17:14	NOTE: Affects software AND OpenGL equally.

(0002324) Edward-san (developer) 2011-12-14 22:51	Can you reproduce this in single player?

(0002374) Torr Samaho (administrator) 2012-01-14 16:44	I doubt that this is caused by the SetActorProperty calls you posted. If they really have to do with this, something else has to destroy the actor before the SetActorProperty calls are made. > It's random, happens seldom-- but only started happening today and not for the past 4+ months that the wad has been up. So that means you didn't change anything in 4 months and the problem suddenly started?

(0002382) Watermelon (developer) 2012-01-14 19:05	I've isolated it to not be the above, it happened to be something before it. I think it was calling on something that didn't exist, but it's now fixed. You can close this or disregard as it seemed to be a fault on my end rather than what I posted-- sorry for any time wasted here.

(0002387) Torr Samaho (administrator) 2012-01-14 20:18	Don't worry. Except for my post above, I didn't spend any time on this yet.

**Issue Community Support**
This issue is already marked as resolved. If you feel that is not the case, please reopen it and explain why.
Supporters:	No one explicitly supports this issue yet.
Opponents:	No one explicitly opposes this issue yet.

Issue History
Date Modified	Username	Field	Change
2011-12-14 16:34	Watermelon	New Issue
2011-12-14 17:14	Watermelon	Note Added: 0002323
2011-12-14 22:51	Edward-san	Note Added: 0002324
2012-01-14 16:44	Torr Samaho	Note Added: 0002374
2012-01-14 16:44	Torr Samaho	Status	new => feedback
2012-01-14 19:05	Watermelon	Note Added: 0002382
2012-01-14 19:05	Watermelon	Status	feedback => new
2012-01-14 20:18	Torr Samaho	Note Added: 0002387
2012-01-14 20:19	Torr Samaho	Status	new => closed
2012-01-14 20:19	Torr Samaho	Resolution	open => no change required
2012-06-09 13:22	Torr Samaho	Category	General => Bug

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