NPE encountered when using dubbo-mock-admin

[cdfive]

Environment

• Dubbo version: 3.0.8
• Dubbo Admin version: 0.4.0
• dubbo-mock-admin version: 3.0.6-SNAPSHOT

Add depedency dubbo-mock-admin in consumer project, using the AdminMockFilter provided.
I found that after mockResult got by mockService.mock(mockContext),
if the result is not enable, theninvoker.invoke(invocation) will throw NPE.

It seems that the consumerUrl has been changed in RpcServiceContext,
the protocolServiceKey is org.apache.dubbo.mock.api.MockService,
and getServiceInfo(protocolServiceKey) can't get the serviceInfo.

Exception trace:

[nio-9092-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause

java.lang.NullPointerException: null
	at org.apache.dubbo.registry.client.InstanceAddressURL.getServiceMethodParameter(InstanceAddressURL.java:243) ~[dubbo-3.0.8.jar:3.0.8]
	at org.apache.dubbo.registry.client.InstanceAddressURL.getMethodParameter(InstanceAddressURL.java:266) ~[dubbo-3.0.8.jar:3.0.8]
	at org.apache.dubbo.common.URL.getMethodParameter(URL.java:834) ~[dubbo-3.0.8.jar:3.0.8]
	at org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker.initLoadBalance(AbstractClusterInvoker.java:425) ~[dubbo-3.0.8.jar:3.0.8]
	at org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:335) ~[dubbo-3.0.8.jar:3.0.8]
	at org.apache.dubbo.rpc.cluster.router.RouterSnapshotFilter.invoke(RouterSnapshotFilter.java:46) ~[dubbo-3.0.8.jar:3.0.8]
	at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:321) ~[dubbo-3.0.8.jar:3.0.8]
	at org.apache.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:99) ~[dubbo-3.0.8.jar:3.0.8]
	at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:321) ~[dubbo-3.0.8.jar:3.0.8]
	at org.apache.dubbo.rpc.protocol.dubbo.filter.FutureFilter.invoke(FutureFilter.java:51) ~[dubbo-3.0.8.jar:3.0.8]
	at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:321) ~[dubbo-3.0.8.jar:3.0.8]
	at org.apache.dubbo.mock.filter.AdminMockFilter.invoke(AdminMockFilter.java:148) ~[dubbo-mock-admin-3.0.6-SNAPSHOT.jar:3.0.6-SNAPSHOT]
	...