Attachement Plugin: undefined index

I've installed the premium plugin attachement.php
When I create a message (with or without an attachement), there is a warning:

Notice: Undefined index: extension in /.../components/com_uddeim/attachment.php on line 50 Notice: Undefined index: extension in /.../components/com_uddeim/attachment.php on line 50 Notice: Undefined index: extension in .../components/com_uddeim/attachment.php on line 50

What can I do?

It is not a warning (or bug). It seems that your php.ini is configured also to report "notices" which are irrelevant.

-- from php manual --
Note:

Enabling E_NOTICE during development has some benefits. For debugging purposes: NOTICE messages will warn you about possible bugs in your code. For example, use of unassigned values is warned. It is extremely useful to find typos and to save time for debugging. NOTICE messages will warn you about bad style. For example, $arr[item] is better to be written as $arr since PHP tries to treat "item" as constant. If it is not a constant, PHP assumes it is a string index for the array.

---

"pathinfo" is exactly used the way the php manual describes ( de2.php.net/pathinfo ). Nevertheless the notice might only be displayed when an attachment is added (it is a first time report and I also use the plugin on several sites with notices on).

Switch off "notices" in your php.ini or add
www.php.net/manual/en/function.error-reporting.php
at the beginning of the script.

A workaround for this nasty php behavior is also

I modified the code so the "notice" is not longer displayed. I reported this bug to php dev in order that they return an empty variable instead of an unset one.