Connecting 2 output nodes to a template node causes error

[AnderssonPeter]

Describe the bug
when using the get template node i get the following error:

Error calling service, home assistant api error: Cannot set property headersSent of #<OutgoingMessage> which has only a getter

To Reproduce
Steps to reproduce the behavior:

1. Connect a inject node call template node connect the template node to 2 debug nodes.
2. Click on 'run it'
3. See error

Expected behavior
it should log 2 messages.

Screenshots

Example Flow

[{
		"id": "87a2a4aa.0b9c38",
		"type": "tab",
		"label": "Test",
		"disabled": false,
		"info": ""
	}, {
		"id": "a86fc2d0.91f45",
		"type": "inject",
		"z": "87a2a4aa.0b9c38",
		"name": "",
		"topic": "",
		"payload": "",
		"payloadType": "date",
		"repeat": "",
		"crontab": "",
		"once": false,
		"onceDelay": 0.1,
		"x": 160,
		"y": 80,
		"wires": [["5cf27320.48e14c"]]
	}, {
		"id": "5cf27320.48e14c",
		"type": "api-render-template",
		"z": "87a2a4aa.0b9c38",
		"name": "test",
		"server": "fa4c0dcc.2c6f8",
		"template": "{% for state in states.plant if state.state == 'problem' -%}\n  {%- if loop.last and not loop.first %} och {% elif not loop.first %}, {% else %} {% endif -%}\n  {{ state.name }}\n{%- endfor %}",
		"x": 330,
		"y": 80,
		"wires": [["f9ce677c.430f18", "5c0ff37c.23676c"]]
	}, {
		"id": "f9ce677c.430f18",
		"type": "debug",
		"z": "87a2a4aa.0b9c38",
		"name": "",
		"active": true,
		"tosidebar": true,
		"console": false,
		"tostatus": false,
		"complete": "false",
		"x": 710,
		"y": 80,
		"wires": []
	}, {
		"id": "5c0ff37c.23676c",
		"type": "debug",
		"z": "87a2a4aa.0b9c38",
		"name": "",
		"active": true,
		"tosidebar": true,
		"console": false,
		"tostatus": false,
		"complete": "false",
		"x": 710,
		"y": 180,
		"wires": []
	}, {
		"id": "fa4c0dcc.2c6f8",
		"type": "server",
		"z": "",
		"name": "Home Assistant",
		"legacy": false,
		"hassio": false,
		"rejectUnauthorizedCerts": true,
		"ha_boolean": "y|yes|true|on|home|open"
	}
]

Environment (please complete the following information):

• Node Red Version: [0.19.5]
• NR Home Assistant Plugin Version: [0.5.1]
• Is Node Red running in Docker: [yes(x64, debian 9 host)]