panic: runtime error: invalid memory address or nil pointer dereference [recovered] about mergo

[darccio]

Please, can you provide an example showing how are you calling MergeWithOverwrite and what kind of parameters?

[aanm]

@imdario Sorry for the delay, my example was more complex so I had to create a simple one.
I also tried with MapWithOverwrite and got the same output, what is the difference between MapWithOverwrite and MergeWithOverwrite?

package test

import (
    "encoding/json"
    "testing"

    "github.com/imdario/mergo"
)

var (
    request    = `{"timestamp":null, "name": "foo"}`
    maprequest = map[string]interface{}{
        "timestamp": nil,
        "name":      "foo",
        "newStuff":  "foo",
    }
)

func TestMergeWithOverwrite(t *testing.T) {
    var something map[string]interface{}
    if err := json.Unmarshal([]byte(request), &something); err != nil {
        t.Errorf("Error while Unmarshalling maprequest %s", err)
    }
    if err := mergo.MergeWithOverwrite(&something, maprequest); err != nil {
        t.Errorf("Error while merging %s", err)
    }
}

[darccio]

Ok, working on it. I add it as an unit test and I'm checking it.

[darccio]

Done. There was missing an "if" to check if the value from src was nil. I should check if there is another corner case like this in other points of the code.