Help !!

[void prawn]

My app crash when I press refer button
This is the error Invalid toNumber block operation
: empty String

Detailed error message:
java.lang.NumberFormatException: empty String
at jdk.internal.math.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1842)
at jdk.internal.math.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
at java.lang.Double.parseDouble(Double.java:662)
at com.hindustaniadda.user.ReferralActivity$7.onChildAdded(ReferralActivity.java:381)
at com.google.firebase.database.core.ChildEventRegistration.fireEvent(ChildEventRegistration.java:79)
at com.google.firebase.database.core.view.DataEvent.fire(DataEvent.java:63)
at com.google.firebase.database.core.view.EventRaiser$1.run(EventRaiser.java:55)
at android.os.Handler.handleCallback(Handler.java:942)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:211)
at android.os.Looper.loop(Looper.java:300)
at android.app.ActivityThread.main(ActivityThread.java:8232)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:580)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1028)

<@&817167410192056320>

@everyone

[novel urchin]

good idea

[void prawn]

@novel urchin help

[novel urchin]

you are trying to convert a empty string to a number

that is causing the error

look for "to number" block

and check what value you are passing into it to convert