Unable to access/drop a vertex after dropping a property key.

We followed the example mentioned here and dropped one property key in our schema, post which we are unable to access/drop any vertex. It is throwing us a Error during serialization: [no message for java.lang.NullPointerException] exception every time we run either g.V(node_id).valueMap() or g.V(node_id).drop().iterate(). We were wondering if there is any way we could recover from this error or any workarounds?
GitHub
Hi here is an issue related with mix index. Java client app connecting with janusgraph-0.5.3-gremlin-server, created a mix index(eg: edgeIndex) for several properties(eg: name, address), then renam...
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