JSON syntax error

Hi,
After updating the plugin in its last version (1.2.13), Google Search Console alert me for an incorrect Structured Data because of JSON syntax error :

"baseSalary": {
		"@type": "MonetaryAmount",
		"currency": "EUR",
		"value": {
			"@type": "QuantitativeValue",
			"minValue": ,
			"maxValue": ,
			"unitText": "YEAR"
		}

It looks like Min&Max Salary fields are empty when not filled in my CPT job offer, causing JSON syntax error.

Restoring the plugin in version 1.1.9 fix the problem because these fields are filled in “0” by default in global settings of the plugin.

Could you fix this issue ?
Thanks in advance