ios 4.1.0 crashes working app

I upgraded my app using:
cordova platform update ios@4.1
did cordova prepare ios, compiled in xcode7.2

When running app in debugger, get:

[CDVCommandQueue executePending] [Line 142] FAILED pluginJSON = ["InAppBrowser1155713999","InAppBrowser","injectScriptCode",["window.location.href",true]]

for each plugin.

if I do
cordova plugin rm pluginname
cordova plugin add pluginname

it all seems to work.