René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"_onNavigatingTo TypeError: Cannot read property 'resolvedPage' of undefined","articleBody":"**Environment**\r\ntns-core-modules has 6.5.25\r\ntns-android has 6.5.3\r\n\r\n**Describe the bug**\r\nRuntime exception due to unchecked null. \r\nSomehow the variable \"backstackEntry\" is null at this point:\r\nhttps://github.com/NativeScript/NativeScript/blob/c040cb28fcca4c86f831197190a33f316af27ecd/nativescript-core/ui/frame/frame-common.ts#L398\r\n\r\nMost likely because backstack[backstack.length - 1] returns undefined here because the length is 0:\r\nhttps://github.com/NativeScript/NativeScript/blob/c040cb28fcca4c86f831197190a33f316af27ecd/nativescript-core/ui/frame/frame-common.ts#L393\r\n\r\n**To Reproduce**\r\nUnknown, it's happening to users in production. Maybe trying to go back repeatedly?\r\n\r\n**Additional context**\r\n\r\n\u003e com.tns.NativeScriptException: Calling js method run failed\r\nTypeError: Cannot read property 'resolvedPage' of undefined\r\nt._onNavigatingTo(\u003cembedded\u003e:37:1212954)\r\nt.performGoBack(\u003cembedded\u003e:37:1212451)\r\nt._processNextNavigationEntry(\u003cembedded\u003e:37:1212100)\r\nt._processNextNavigationEntry(\u003cembedded\u003e:37:107712)\r\nt._processNavigationQueue(\u003cembedded\u003e:37:1211284)\r\nt.setCurrent(\u003cembedded\u003e:37:109498)\r\n(\u003cembedded\u003e:37:2105307)\r\n(\u003cembedded\u003e:37:1207022)\r\nrun(\u003cembedded\u003e:37:1207081)\r\ncom.tns.Runtime.callJSMethodNative(Native Method)\r\ncom.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1286)\r\ncom.tns.Runtime.callJSMethodImpl(Runtime.java:1173)\r\ncom.tns.Runtime.callJSMethod(Runtime.java:1160)\r\ncom.tns.Runtime.callJSMethod(Runtime.java:1138)\r\ncom.tns.Runtime.callJSMethod(Runtime.java:1134)\r\ncom.tns.gen.java.lang.Runnable.run(Runnable.java:17)\r\nandroid.os.Handler.handleCallback(Handler.java:789)\r\nandroid.os.Handler.dispatchMessage(Handler.java:98)\r\nandroid.os.Looper.loop(Looper.java:164)\r\nandroid.app.ActivityThread.main(ActivityThread.java:6944)\r\njava.lang.reflect.Method.invoke(Native Method)\r\ncom.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)\r\ncom.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)\r\n\r\n\r\n\r\n\r\n","author":{"url":"https://github.com/hiperbou","@type":"Person","name":"hiperbou"},"datePublished":"2021-02-09T17:07:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/9204/NativeScript/issues/9204"}