Inappbrowser crashes in iPhone 5 or 5c

When using the InAppBrowser plugin in an ionic 2 project, the InAppBrowser window would not display in iPhone 5 or iPhone 5c.

Example code:

new InAppBrowser(url, '_blank', 'location=false');

The logs:
2017-03-07 09:30:20.204 My App[19636:7391110] -[__NSCFString charValue]: unrecognized selector sent to instance 0x7ca47270
2017-03-07 09:30:20.206 My App[19636:7391110] *** WebKit discarded an uncaught exception in the webView:decidePolicyForNavigationAction:request:frame:decisionListener: delegate: <NSInvalidArgumentException> -[__NSCFString charValue]: unrecognized selector sent to instance 0x7ca47270

I suspect it is similar to http://stackoverflow.com/questions/31408909/nscfstring-charvalue-unrecognized-selector-sent-to-instance

When I use "_self" instead of "_blank", there is no problem opening the system browser.