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TypeError: Cannot read property 'getHolding' of null

See original GitHub issue

I’m submitting a Problem

( x ) unexpected behavior => please visit the Wiki before

Current behavior

{“message”:“TypeError: Cannot read property ‘getHolding’ of null”,“source”:{“id”:“96ca2d57.1abac”,“type”:“modbus-server”,“name”:“”,“count”:1},“stack”:“TypeError: Cannot read property ‘getHolding’ of null\n at null.<anonymous> (/home/wwwroot/.node-red/node_modules/node-red-contrib-modbus/modbus/maps/modbus-server.js:131:40)\n at emitOne (events.js:77:13)\n at null.emit (events.js:169:7)\n at null.Node.receive (/usr/local/lib/node_modules/node-red/red/runtime/nodes/Node.js:215:14)\n at InjectNode.Node.send (/usr/local/lib/node_modules/node-red/red/runtime/nodes/Node.js:137:22)\n at InjectNode.<anonymous> (/usr/local/lib/node_modules/node-red/nodes/core/core/20-inject.js:77:22)\n at emitOne (events.js:77:13)\n at InjectNode.emit (events.js:169:7)\n at InjectNode.Node.receive (/usr/local/lib/node_modules/node-red/red/runtime/nodes/Node.js:215:14)\n at /usr/local/lib/node_modules/node-red/nodes/core/core/20-inject.js:105:22\n at Layer.handle [as handle_request] (/usr/local/lib/node_modules/node-red/node_modules/express/lib/router/layer.js:95:5)\n at next (/usr/local/lib/node_modules/node-red/node_modules/express/li…”}

Minimal reproduction of the problem with instructions

After deploying the project on server using one of the example flows gives the above error.
Fixed issue with node version & npm version.
Node-Red manage palette has disappeared.

Your Environment

Please tell us about your environment:

Device :
- ( ) macOS: v
- ( x ) Linux: v 16.04
- ( ) Windows: v
- ( ) Raspbian: v
- ( ) Other:
  - Name:
  - Version:
node-red-contrib-modbus version: 3.6.1