CC3200 json.h library memory problem

Hello,

I had been using jsmn.h lib for JSON parser but I changed the library with json.h library in my project. I wrote code;

jsonParser parser;
jsonObj object;

object = json_parser_init(&parser, g_clogData);

rValue = (char*)malloc(128);
memset(rValue, NULL, sizeof(rValue));
rValue = json_object_get_string(&parser, object, "IR", rValue);

json_parser_deinit(&parser);
free(rValue);

It works but after 5-6 times my code doesn't work anymore because of memory fault. I don't understand which one causes memory problem? Is json.h library is stable about memory usage?

Turan