filter delEvent when querynode register fail (#6150)

Signed-off-by: Nxige-16 <xi.ge@zilliz.com>

internal/querycoord/query_coord.go

@@ -239,6 +239,7 @@ func (qc *QueryCoord) watchNodeLoop() {
 				}()
 			case sessionutil.SessionDelEvent:
 				serverID := event.Session.ServerID
+				if _, ok := qc.cluster.nodes[serverID]; ok {
 					log.Debug("query coordinator", zap.Any("The QueryNode crashed with ID", serverID))
 					qc.cluster.nodes[serverID].setNodeState(false)
 					qc.cluster.nodes[serverID].client.Stop()
@@ -275,6 +276,7 @@ func (qc *QueryCoord) watchNodeLoop() {
 				}
 			}
 		}
+	}
 }
 
 func (qc *QueryCoord) watchMetaLoop() {