IOS app is crashing on IOS 7.1 but works with IOS 8

I have an app that is live on the app store, but it isn't launching on IOS 7.1 devices. I set the deployment target for IOS 7.1, but my base sdk is IOS 8. It makes sense that this would case a crash on non-ios8 devices. Am I correct in my thinking? Do I need to go back and use the IOS 7.1 SDK??

Copyright Notice：Content Author:「user3786591」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/26268178/ios-app-is-crashing-on-ios-7-1-but-works-with-ios-8

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