Problem with email - Warning: mb_strstr() [function.mb-strstr]: Empty haystack in email.php

[g_p_java]

Hello,

 

i added a new email in the admin pages [configuration-MyStore-Send Extra Order emails to]

since i wanted the administrator to get informed in case there was a new order.

 

Now i get the following warning in checkout_process.php page:

 

Warning: mb_strstr() [function.mb-strstr]: Empty haystack in catalog\includes\classes\email.php
Warning: mb_strstr() [function.mb-strstr]: Empty haystack in catalog\includes\classes\email.php
Warning: Cannot modify header information - headers already sent by (output started at \catalog\includes\classes\email.php:507) in \catalog\includes\functions\general.php on line 48

 

What can i do in order to fix that?

 

Important note: only after i added a new email in the "send extra order email to" option,

i had that problem. Before that, i didn't have any problem.

 

Thanks, in advance