[BUG] NullPointerException using session receiver and tracing

[conniey]

Describe the bug
java.lang.NullPointerException encountered when tracing is enabled and accepting next session.

Exception or Stack Trace

java.lang.NullPointerException
at com.azure.messaging.servicebus.implementation.instrumentation.ServiceBusTracer.endSpan(ServiceBusTracer.java:130)
at com.azure.messaging.servicebus.implementation.instrumentation.ServiceBusTracer.lambda$traceMono$18(ServiceBusTracer.java:392)
at reactor.core.publisher.FluxDoOnEach$DoOnEachSubscriber.onError(FluxDoOnEach.java:186)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.lambda$onError$2(TracingSubscriber.java:67)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.withActiveSpan(TracingSubscriber.java:86)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.onError(TracingSubscriber.java:67)
at reactor.core.publisher.FluxHide$SuppressFuseableSubscriber.onError(FluxHide.java:142)
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onError(MonoFlatMap.java:172)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.lambda$onError$2(TracingSubscriber.java:67)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.withActiveSpan(TracingSubscriber.java:86)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.onError(TracingSubscriber.java:67)
at reactor.core.publisher.SerializedSubscriber.onError(SerializedSubscriber.java:124)
at reactor.core.publisher.FluxRetryWhen$RetryWhenMainSubscriber.whenError(FluxRetryWhen.java:225)
at reactor.core.publisher.FluxRetryWhen$RetryWhenOtherSubscriber.onError(FluxRetryWhen.java:274)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.lambda$onError$2(TracingSubscriber.java:67)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.withActiveSpan(TracingSubscriber.java:86)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.onError(TracingSubscriber.java:67)
at reactor.core.publisher.FluxFlatMap$FlatMapMain.checkTerminated(FluxFlatMap.java:843)
at reactor.core.publisher.FluxFlatMap$FlatMapMain.drainLoop(FluxFlatMap.java:609)
at reactor.core.publisher.FluxFlatMap$FlatMapMain.drain(FluxFlatMap.java:589)
at reactor.core.publisher.FluxFlatMap$FlatMapMain.innerError(FluxFlatMap.java:864)
at reactor.core.publisher.FluxFlatMap$FlatMapInner.onError(FluxFlatMap.java:991)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.lambda$onError$2(TracingSubscriber.java:67)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.withActiveSpan(TracingSubscriber.java:86)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.onError(TracingSubscriber.java:67)
at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onError(MonoPeekTerminal.java:258)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.lambda$onError$2(TracingSubscriber.java:67)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.withActiveSpan(TracingSubscriber.java:86)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.onError(TracingSubscriber.java:67)
at reactor.core.publisher.MonoPublishOn$PublishOnSubscriber.run(MonoPublishOn.java:187)
at org.springframework.cloud.sleuth.instrument.reactor.ReactorSleuth.lambda$null$6(ReactorSleuth.java:330)
at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:68)
at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:28)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
Suppressed: com.azure.core.amqp.exception.AmqpException: status-code: 500, status-description: The service was unable to process the request; please retry the operation. For more information on exception types and proper exception handling, please refer to http://go.microsoft.com/fwlink/?LinkId=761101, errorContext[NAMESPACE: REDACTED ERROR CONTEXT: N/A, PATH: $cbs, REFERENCE_ID: cbs:receiver, LINK_CREDIT: 19]
at com.azure.core.amqp.implementation.ExceptionUtil.amqpResponseCodeToException(ExceptionUtil.java:116)
at com.azure.core.amqp.implementation.ClaimsBasedSecurityChannel.lambda$authorize$0(ClaimsBasedSecurityChannel.java:74)
at reactor.core.publisher.FluxHandle$HandleSubscriber.onNext(FluxHandle.java:110)
at io.opentelemetry.javaagent.shaded.instrumentation.reactor.v3_1.TracingSubscriber.lambda$onNext$1(TracingSubscriber.java:62)

To Reproduce

Code Snippet

Expected behavior
No exception.

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Setup (please complete the following information):

• OS: [e.g. iOS]
• IDE: [e.g. IntelliJ]
• Library/Libraries: azure-messaging-servicebus 7.14.0
• Java version: [e.g. 8]

Additional context
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