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Time series was not in correct order. Since it is a time chart, labels should be in either ascending or descending order.
changing the time to the below order fixed the issue
data: {
labels: [
"2018-12-04 00:00:14.000000"
"2018-12-05 11:45:14.000000",
"2018-12-05 12:00:14.000000",
"2018-12-05 13:00:15.000000",
"2018-12-05 14:00:14.000000",
],
Source:stackexchange.com