[Bug] logCallbackHandle is null

[crimsonvspurple]

Library version used

1.15.1

Java version

17x86 temurin

Scenario

PublicClient (AcquireTokenInteractive, AcquireTokenByUsernamePassword)

Is this a new or an existing app?

The app is in production, I haven't upgraded MSAL, but started seeing this issue

Issue description and reproduction steps

Our MSAL integration haven't been used for a while after initial implementation and now we are testing it again and we get this weird issue that we haven't seen before.

Caused by: com.microsoft.aad.msal4j.MsalClientException: Error occurred when calling MSALRuntime logging API: Cannot invoke "com.microsoft.azure.javamsalruntime.LogCallbackHandle.release()" because "com.microsoft.azure.javamsalruntime.MsalRuntimeInterop.logCallbackHandle" is null
    at com.microsoft.aad.msal4jbrokers.Broker.enableBrokerLogging(Broker.java:228)

Do you have any idea what could cause this?

I don't understand this function. If it gets enableLogging=true, it checks if logCallbackHandle == null but if it gets false, it assumes logCallbackHandle is not null and attemps to call a function on it. Why?

And I can't even see this library code on github because it is behind a private repo.

Relevant code snippets

public static synchronized void enableLogging(boolean enableLogging) {
        if (enableLogging) {
            // Avoid calling logging APIs if logging is already enabled
            if (logCallbackHandle == null) {
                LogCallbackHandle handle = new LogCallbackHandle();

                ERROR_HELPER.checkMsalRuntimeError(MSALRUNTIME_LIBRARY.MSALRUNTIME_RegisterLogCallback(
                        logCallback, null, handle));

                // Assign the handle to the global variable only after a successful call to
                // RegisterLogCallback
                logCallbackHandle = handle;
            }

        } else {
            // According to comments in MSALRuntime's MSALRuntimeLogging.h, releasing the log
            // callback handle will de-register it
            logCallbackHandle.release();
            logCallbackHandle = null;
        }
    }

Expected behavior

No response

Identity provider

Microsoft Entra ID (Work and School accounts and Personal Microsoft accounts)

Regression

No response

Solution and workarounds

No response