PHP causing seg fault

Hi guys, I'm attempting to run a SugarCRM variant that uses SOAP to access information from the database. The code is causing a seg fault when executing a particular line of code. The code executes properly until it calls a generic function in the parent class that causes a seg fault on the return command. The line of code is: return $this; I've found this to be a problem in PHP version 5.1.4 and 5.2.0rc4. Is this statement illegal in PHP5? When I set a memory limit for the script, the error changes to indicating that it has exceeded its memory allocation, so it seems to be allocating memory over and over. Note that this code runs fine on most other combinations of functions calling this same parent method. Any suggestions are appreciated. Thanks, Glenn.