De-allocate Memory for Citrix Function

Hello Everyone

I am working with Citrix protocol (HP LoadRunner). In my script i am using ctrx_get_window_name() function to retrieve window name. The function is used inside a for loop and might burn out my LG memory, i want to de-allocate the memory now. I used free() function to de-allocate the memory, it has no issues in vugen but when i replay the script in performance center it kills the mdrv process causing my users to fail, if comment the free() function script is passing without any issue in PC. Please let me know how to de-allocate memory for ctrx_get_window_name().