Php error with making a new webform

Could you please specify more exactly what steps lead up to this error ?

I can't recreate this problem.
The steps are
- add/webform
- press Add to add a new text field
- enter a name, description and width of the field
- press done.
Here I get the main webform-form again.
With both a preview and a submitt button.

Could be.
I don't have access to any machine with PHP5 but I will do a change that might solve it and add the patch here for you to try. =/

This error is common among modules using 4.6 and PHP 5. I have same problem, and also with subscriptions & a few other ones.

See this post for the subscriptions fix, perhaps that would help to find a fix for this one.

http://drupal.org/node/22849

Fixed in CVS for 4.6

I use webform-cvs and PHP 5.0.2. I have same problem.

warning: array_merge() [function.array-merge]: Argument #2 is not an array in /data/domains/satortabor.hu/web/webroot/modules/webform/webform.module on line 280.

Ok lets clarify

It is fixed in the _4.6.0_ branch of CVS. This branch is packaged as the 4.6.0 drop every day or so.
So you will want to get this file.
http://drupal.org/files/projects/webform-4.6.0.tar.gz

I haven't merged this changes into the CVS branch since I'm currently working with something else in this branch. This means that the -cvs.tar.gz file is NOT fixed yet. I will post a note here when I've done the merge.

I know this is (more than) a little confusing but it's the way the drupal project system works.

Ok. I get http://drupal.org/files/projects/webform-4.6.0.tar.gz. The problem is the same. Not on line 280. On line 283. (Sorry for bad english :-[)

warning: array_merge() [function.array-merge]: Argument #2 is not an array in /data/domains/satortabor.hu/web/webroot/modules/webform/webform.module on line 283.

Ok ... sorry about that.
I've checked in a new patch it will be in the -4.6.0.tar.gz in a few hours.

Thanks! And sorry. :-[ Here is the new error when the user post the form:

warning: array_merge() [function.array-merge]: Argument #1 is not an array in /data/domains/satortabor.hu/web/webroot/includes/menu.inc on line 351.

OK,
Since it does not occure in webform I would say it is a problem in the core code.
However if it only occures after the user submits the form it is most likley due to a error in webform.
From error message I have problems finding out from where the call originated.

What page is displayed when the error occures ? Is it the webform or the confirmation message ?
What is the url field in your browser showing ?

The displayed page is the confirmation massage.
The URL field: http://www.satortabor.hu/index.php?q=webform/done/45.

I got the same error (Argument #2 is not an array) using PHP 5, whether editing or updating a form. I got a blank page with half the fields missing, and no error or confirmation message, each time I submitted a new webform or added fields to an existing one. It seems to be caused when $old_edit is empty (and is not an array). So I just added some lines to set this variable to an empty array if $old_edit is empty:

if (!is_array($old_edit)) {
    $old_edit = array();
}

Sorry I haven't supplied this as a patch, but I'm having trouble keeping track of which versions people are using. I think I'm using an old CVS version, which may or may not be in sync with 4.6.