As a Geotags developer, I would like to help you with your issue but I will need a bit more information from you. Could you please answer the following questions?
1. What version of iPhone OS are you running? 2. What version of Geotags are your running? 3. Can you reproduce the crash every time you take a photo? If so, can you please provide the exact steps leading to the crash? 4. In relation to 3, can you reproduce the crash right after you've rebooted your iPhone (power off then on)?
If you prefer to communicate with me by e-mail, please write to geotags@fasterre.com.