There're many reasons can cause the crash.
First, please check that iTunes can recognize your iPhone/iPad, if yes, contact us with details about version of iOS and iTunes.
Otherwise, if Cefipx crashes, and there is something like "Reason: *** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects" contained in the crash report.
This is always because that your system or hard disk get errors. Please try to fix the disk errors with "Disk Utility", or reinstall your Mac system.