helm error when updating: UPGRADE FAILED: The order in patch list

I’ve found that the reason of this problem was that I had some envVars duplicated. In my deployment I had:

...
spec:
  template:
    spec:
      container:
        env:
        - name:  ENV_VAR_NAME
          value: "test"
        - name:  ENV_VAR_NAME
          value: "test"
...

After removing the duplicated variable:

...
spec:
  template:
    spec:
      container:
        env:
        - name:  ENV_VAR_NAME
          value: "test"
...

The helm upgrade [RELEASE] [CHART] worked fine