addBuildPhase keeps adding phases when they already exist

This is the build script line

```
xcodeProject.addBuildPhase(
[], 'PBXShellScriptBuildPhase', 'Configure Crashlytics', undefined, options
).buildPhase;
fs.writeFileSync(xcodeProjectPath, xcodeProject.writeSync());
$logger.trace('Xcode project written');
} else {
$logger.error(xcodeProjectPath + ' is missing.');
reject();
return;
}
```

So I guess everytime the CLI build runs it adds a NEW "Configure Crashlytics" to the build phase. Eventually my machine just outright died because the script was running hundreds of times.

Is there maybe a way before this I can check to see if it exists first before just adding it again?