Java Lang NullPointerException uriString error on Blazor Hybrid

[Boot Dat]

IJSRuntime calls working on my existing WASM app but isn't working on my Hybrid App, It gives Java.Lang.NullPointerException: uriString error.

Toolbaritems.Add(new ItemModel { Text = "Receipt", TooltipText = "Preview selected order", PrefixIcon = "e-properties-2" });

if (args.Item.Text == "Receipt")
{
    //Code for editing - Check that an Order has been selected from the grid
    if (selectedPOHeaderID == 0)
    {
        WarningHeaderMessage = "Warning!";
        WarningContentMessage = "Please select an Order from the grid.";
        Warning.OpenDialog();
    }
    else
    {
        await IJS.InvokeAsync<object>("open", new object[] { "/previeworder/" + selectedPOHeaderGuid + "", "_blank" });
    }
Once the function is called, the app ends and gives that exception and I have no idea what it means. I looked it up but couldn't find any explanation to help resolve the problem.
in the console:

**Java.Lang.NullPointerException:** 'Loading...'

**Java.Lang.NullPointerException:** 'uriString'

[mono-rt] [ERROR] FATAL UNHANDLED EXCEPTION: Java.Lang.NullPointerException: uriString
[mono-rt]    at Java.Interop.JniEnvironment.StaticMethods.CallStaticObjectMethod(JniObjectReference type, JniMethodInfo method, JniArgumentValue* args) in /Users/runner/work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop/Java.Interop/JniEnvironment.g.cs:line 12890
[mono-rt]    at Java.Interop.JniPeerMembers.JniStaticMethods.InvokeObjectMethod(String encodedMember, JniArgumentValue* parameters) in /Users/runner/work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.JniStaticMethods.cs:line 95
[mono-rt]    at Android.Net.Uri.Parse(String uriString) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net6.0/android-31/mcw/Android.Net.Uri.cs:line 1164
[mono-rt]    at Microsoft.AspNetCore.Components.WebView.Maui.BlazorWebChromeClient.OnCreateWindow(WebView view, Boolean isDialog, Boolean isUserGesture, Message resultMsg) in D:\a\_work\1\s\src\BlazorWebView\src\Maui\Android\BlazorWebChromeClient.cs:line 24
[mono-rt]    at Android.Webkit.WebChromeClient.n_OnCreateWindow_Landroid_webkit_WebView_ZZLandroid_os_Message_(IntPtr jnienv, IntPtr native__this, IntPtr native_view, Boolean isDialog, Boolean isUserGesture, IntPtr native_resultMsg) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net6.0/android-31/mcw/Android.Webkit.WebChromeClient.cs:line 650
[mono-rt]    at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPLZZL_Z(_JniMarshal_PPLZZL_Z callback, IntPtr jnienv, IntPtr klazz, IntPtr p0, Boolean p1, Boolean p2, IntPtr p3) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:line 396
[mono-rt]   --- End of managed Java.Lang.NullPointerException stack trace ---
[mono-rt] java.lang.NullPointerException: uriString
[mono-rt] 	at android.net.Uri$StringUri.(Uri.java:476)
[mono-rt] 	at android.net.Uri$StringUri.(Unknown Source:0)
[mono-rt] 	at android.net.Uri.parse(Uri.java:438)
[mono-rt] 	at crc64d693e2d9159537db.BlazorWebChromeClient.n_onCreateWindow(Native Method)
[mono-rt] 	at crc64d693e2d9159537db.BlazorWebChromeClient.onCreateWindow(BlazorWebChromeClient.java:30)
[mono-rt] 	at zu.addNewContents(chromium-Monochrome.aab-stable-584516321:34)
[mono-rt] 	at android.os.MessageQueue.nativePollOnce(Native Method)
[mono-rt] 	at android.os.MessageQueue.next(MessageQueue.java:325)
[mono-rt] 	at android.os.Looper.loop(Looper.java:142)
[mono-rt] 	at android.app.ActivityThread.main(ActivityThread.java:6944)
[mono-rt] 	at java.lang.reflect.Method.invoke(Native Method)
[mono-rt] 	at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
[mono-rt] 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
[mono-rt]
[mono-rt]   --- End of managed Java.Lang.NullPointerException stack trace ---
[mono-rt] java.lang.NullPointerException: uriString
[mono-rt] 	at android.net.Uri$StringUri.(Uri.java:476)
[mono-rt] 	at android.net.Uri$StringUri.(Unknown Source:0)
[mono-rt] 	at android.net.Uri.parse(Uri.java:438)
[mono-rt] 	at crc64d693e2d9159537db.BlazorWebChromeClient.n_onCreateWindow(Native Method)
[mono-rt] 	at crc64d693e2d9159537db.BlazorWebChromeClient.onCreateWindow(BlazorWebChromeClient.java:30)
[mono-rt] 	at zu.addNewContents(chromium-Monochrome.aab-stable-584516321:34)
[mono-rt] 	at android.os.MessageQueue.nativePollOnce(Native Method)
[mono-rt] 	at android.os.MessageQueue.next(MessageQueue.java:325)
[mono-rt] 	at android.os.Looper.loop(Looper.java:142)
[mono-rt] 	at android.app.ActivityThread.main(ActivityThread.java:6944)
[mono-rt] 	at java.lang.reflect.Method.invoke(Native Method)
[mono-rt] 	at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
[mono-rt] 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
[mono-rt]
What does this mean and how can i fix it ?

[BharatRam Harikrishnan]

Hi Boot,

Based on the details you provided, we have prepared a Blazor Maui App with the Syncfusion Blazor Grid component and its toolbar support. When the toolbar's Receipt item is clicked, it calls a JavaScript function named "myJsFunction" using the JSRuntime.InvokeAsync method. However, we were unable to reproduce the reported issue. It calls the JS function from C# code without any issues.

 

Please find the following sample for reference: https://www.syncfusion.com/downloads/support/directtrac/general/ze/Sample741070269

 

Could you please check the above sample and provide us with a step-by-step replication procedure to replicate the issue?

Regards,

Bharat Ram H