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I had a problem performing save due to an error saying "Can't call method 'Get' on an undefined value". My TWiki-Version is TWiki-4.2.0, Tue, 22 Jan 2008, build 16278. Suddenly the error occured after we were able to create about 45 topics without problems. The problem only occured when I tried to create new topic using my TWikiForm and the generation of unique topic names using TopicXXXXXXXXXX. Creating a simple topic and saving it worked without problems. Restarting the apache does not help.

I modified the Save.pm a little and the error does not occur any more. My question is, whether my modification is allright.

Here is what I've done: In the apache - error log I saw that the error was raised in Save.pm in line 257:

[Mon Aug 04 08:41:57 2008] [error] [client] Can't call method "get" on an undefined value at /srv/www/htdocs/twiki/lib/TWiki/UI/Save.pm line 257., referer: http://borgsapp01.hg.fresenius.de/twiki /bin/edit.pl

The original line 257 in Save.pm:

my $pti = $prevMeta->get( 'TOPICINFO' );

It seemed that $prevMeta is not defined. So to fix it, I added for following code (see lines below #JR 04.08.2008...).

Line 257 in Save.pm after modification:

#JR 04.08.2008: Added check if $prevMeta is defined. Otherwise error message "Can't call method "get" on an undefined value" occurs

if ( $prevMeta ) {

    my $pti = $prevMeta->get( 'TOPICINFO' ); ...


    if( $formDef && $prevMeta ) { $newMeta->merge( $prevMeta, $formDef ); }

    $merged = [ $orev, $author, $rev||1 ];

#JR 04.08.2008: End of modification



TWiki version: TWiki Release 4.2.0
TWiki plugins: CommentPlugin, EmptyPlugin, EditTablePlugin, InterwikiPlugin, PreferencesPlugin, RenderListPlugin, SlideShowPlugin, SmiliesPlugin, SpreadSheetPlugin, TablePlugin, TinyMCEPlugin, TwistyPlugin, WysiwygPlugin
Server OS: SuSE SLES 9.2 [configure.pl: Linux 2.6.5 (i586-linux-thread-multi)]
Web server: Apache 2.0.49 (Linux/SuSE)
Perl version: 5.008003
Client OS: Windows XP
Web Browser: IE 6
Categories: Version Control, Forms, Fatal Error

-- TWikiGuest - 04 Aug 2008


ALERT! If you answer a question - or someone answered one of your questions - please remember to edit the page and set the status to answered. The status selector is below the edit box.

Thanks, probably best tracked as a bug item.

-- PeterThoeny - 06 Nov 2008

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Topic revision: r2 - 2008-11-06 - PeterThoeny
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