我使用Titanium Studio制作了一款iPhone应用程序。 我使用了WebView组件。
当javascript代码执行时，iPhone应用程序崩溃。
window.location = "urlscheme://page_loaded";
我应该如何避免它？
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** setObjectForKey: object cannot be nil (key: source)'
[INFO] : *** First throw call stack:
[INFO] : (
[INFO] : 0 CoreFoundation 0x0488f1e4 __exceptionPreprocess + 180
[INFO] : 1 libobjc.A.dylib 0x043428e5 objc_exception_throw + 44
[INFO] : 2 CoreFoundation 0x04918eb8 -[__NSDictionaryM setObject:forKey:] + 888
[INFO] : 3 Appname 0x001fd8de -[TiApp application:openURL:sourceApplication:annotation:] + 318
[INFO] : 4 UIKit 0x018662f6 -[UIApplication _applicationOpenURL:payload:] + 318
[INFO] : 5 UIKit 0x0186634b -[UIApplication _applicationOpenURL:event:] + 51
[INFO] : 6 UIKit 0x01872095 -[UIApplication handleEvent:withNewEvent:] + 3776
[INFO] : 7 UIKit 0x01872555 -[UIApplication sendEvent:] + 85
[INFO] : 8 UIKit 0x0185f250 _UIApplicationHandleEvent + 683
[INFO] : 9 GraphicsServices 0x04aedf02 _PurpleEventCallback + 776
[INFO] : 10 GraphicsServices 0x04aeda0d PurpleEventCallback + 46
[INFO] : 11 CoreFoundation 0x0480aca5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
[INFO] : 12 CoreFoundation 0x0480a9db __CFRunLoopDoSource1 + 523
[INFO] : 13 CoreFoundation 0x0483568c __CFRunLoopRun + 2156
[INFO] : 14 CoreFoundation 0x048349d3 CFRunLoopRunSpecific + 467
[INFO] : 15 CoreFoundation 0x048347eb CFRunLoopRunInMode + 123
[INFO] : 16 GraphicsServices 0x04aec5ee GSEventRunModal + 192
[INFO] : 17 GraphicsServices 0x04aec42b GSEventRun + 104
[INFO] : 18 UIKit 0x0185ef9b UIApplicationMain + 1225
[INFO] : 19 Appname 0x00003348 main + 456
[INFO] : 20 libdyld.dylib 0x0512e725 start + 0
[INFO] : )
[INFO] : libc++abi.dylib: terminating with uncaught exception of type NSException
环境：