segmentation fault at to small stacksize( ulimit -s)

Hello, i have a question the installation-list could not solve.thus i try my luck here... I have a script (php-cli) which results in segfault. If i increase stack size by... ulimit -s unlimited ...the script is running and shows correct memory-limit error message. My system's stack size default is 8192 kb What to do if i want to avoid this segfault but not increasing stack size to unlimited because there may be other consequences? What is the recommended way to solve this? Thanks, Hajo