If you are running windows 10, follow these steps:
1) Locate where your game is installed. (e.g. if installed via steam, go to Steam>steamapps>common>NavyFIELD. If installed through this website, look in the default directory)
2) Right click on NavyFIELD (application). Go to properties. Under the compatibility tab, click "Change settings for all users." You should now have a pop-up dialog box. Check "Run this program in compatibility mode for:" and select Windows XP serivce pack 2. Check "Run this program as an administrator." Repeat these steps for NavyFIELD_Launcher, which should be located in the same directory.
3) Open your control panel > System and Security > System > Advanced System Settings (on the left side). In the advanced tab, locate the performance section and click Settings. You should now have a pop-up dialog box titled "Performance options." Go to the Data Execution Prevention tab. Tick "Turn on DEP for all programs and services except those I select." Add NavyFIELD and NavyFIELD_Launcher to this list.
4) Restart your computer.
You should notice a significant decrease in crashes.