JPGraph error.

Hey guys. In my system we´ve got an option of getting charts of some data and it´s many options. My problem is that it works fine on my test server but in my client´s server it gives me the following error as you can see. *** glibc detected *** /var/www/html/bin/httpd: munmap_chunk(): invalid pointer: 0x0a319b78 *** ======= Backtrace: ========= /lib/libc.so.6(cfree+0x1bb)[0x17d81b] /var/www/html/modules/libphp5.so(_efree+0x7e)[0x4bd35e] /var/www/html/modules/libphp5.so(zend_hash_destroy+0x5c)[0x4dbd7c] /var/www/html/modules/libphp5.so(_zval_dtor_func+0x55)[0x4d27e5] /var/www/html/modules/libphp5.so(_zval_ptr_dtor+0x4f)[0x4c7f0f] /var/www/html/modules/libphp5.so(zend_hash_destroy+0x36)[0x4dbd56] /var/www/html/modules/libphp5.so(destroy_zend_class+0x3a)[0x4cb86a] /var/www/html/modules/libphp5.so[0x4dba07] /var/www/html/modules/libphp5.so(zend_hash_reverse_apply+0x57)[0x4dbb47] /var/www/html/modules/libphp5.so(shutdown_executor+0x404)[0x4c85c4] /var/www/html/modules/libphp5.so(zend_deactivate+0x93)[0x4d2e83] /var/www/html/modules/libphp5.so(php_request_shutdown+0x1e0)[0x497bd0] /var/www/html/modules/libphp5.so[0x548927] /var/www/html/bin/httpd(ap_run_handler+0x59)[0x8074bf9] /var/www/html/bin/httpd(ap_invoke_handler+0x67)[0x8077d67] /var/www/html/bin/httpd(ap_process_request+0x178)[0x808e308] /var/www/html/bin/httpd[0x808b60b] /var/www/html/bin/httpd(ap_run_process_connection+0x59)[0x807bb19] /var/www/html/bin/httpd[0x80a1240] /var/www/html/bin/httpd[0x80a1537] /var/www/html/bin/httpd(ap_mpm_run+0x880)[0x80a1e90] /var/www/html/bin/httpd(main+0x845)[0x80629d5] /lib/libc.so.6(__libc_start_main+0xdc)[0x129f2c] /var/www/html/bin/httpd(apr_os_proc_mutex_put+0x5d)[0x8061be1] ======= Memory map: ======== [Thu Feb 25 16:17:20 2010] [notice] child pid 2850 exit signal Aborted (6) Does anybody know why is it happening? Thanks in advance. João.