Plugin Un-install fails for iOS with plist strings

<config-file target="*-Info.plist" parent="UIBackgroundModes">
<array>
<string>audio</string>
<string>fetch</string>
 </array>
</config-file>

Uninstalling org.wbez.cordova.flimflam from android
Uninstalling org.wbez.cordova.flimflam from ios
TypeError: Cannot read property 'buffer' of undefined
    at walk_obj (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/node_modules/plist/lib/build.js:131:18)
    at walk_obj (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/node_modules/plist/lib/build.js:98:7)
    at walk_obj (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/node_modules/plist/lib/build.js:109:9)
    at Object.build (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/node_modules/plist/lib/build.js:76:3)
    at ConfigFile_save [as save] (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/plugman/util/config-changes.js:574:47)
    at /usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/plugman/util/config-changes.js:446:49
    at Array.forEach (native)
    at ConfigKeeper_save_all [as save_all] (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/plugman/util/config-changes.js:444:31)
    at PlatformMunger_save_all [as save_all] (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/plugman/util/config-changes.js:128:24)
    at Object.exports.process (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/plugman/util/config-changes.js:81:12)