Application crash using Qualcomm library for IOS Application

Question

I am using Qualcomm library for my application. My application works fine on iPhone 4S but when I try to install on iPhone 4 then it crashes. The relevant code is:

QCAR::Frame frame = state.getFrame();
int frame.getNumImages();

with the app crashing on the getNumImages line.

I've tested the app on instrument with leaks option and it show me leaks on:

NSInteger initSuccess = QCAR::init();

with the "Heavies Backtrace" message.

How can I prevent this from crashing?