java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toLowerCase()' on a null object reference

[mustafaberk1996]

Describe the bug
I am getting an error that is NullPointerException. It is in WorldData.java file where in this library.

To Reproduce

1. just write World.init(applicationContext) in App file or an Activity file.

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

Additional context
I hadn't been getting this error before but now I am getting. It is weird I also use this library in my another app and this library is working as well there.

[blongho]

Hi @mustafaberk1996 ,

Which version of the library are you using?

[mustafaberk1996]

I was using the latest version but I removed the library. Now I am using FlagKit library and there is no issue until now.

[IvLink-dev]

Hi @mustafaberk1996, I think you use proguard and forgot to add proguard rules
-keep class com.blongho.** {
;
}
-keep interface com.blongho.*
-keeppackagenames com.blongho.country_data
-keepclassmembers class com.blongho.country_data.* {
public *;
}
-keep class com.blongho.country_data.R {
*;
}

[waheedkhan-dev]

Facing same issue on a release build with isMinifyEnabled = true and isShrinkResources = false
Also add the proguard rules mention above