Preflight Checklist

• I have searched theissue tracker for an issue that matches the one I want to file, without success.
• I am not looking for support or already pursued the availablesupport channels without success.
• I have checked thetroubleshooting guide for my problem, without success.

Viper Version

1.20.0

Go Version

1.23

Config Source

Files

Format

YAML

Repl.it link

https://replit.com/@graffic/MergeInConfig-error

Code reproducing the issue

package mainimport ("github.com/spf13/viper")funcmain() {v:=viper.New()v.SetConfigFile("config.yaml")err:=v.MergeInConfig()iferr!=nil {panic(err)}}

Expected Behavior

I would expect that the configuration type detected inMergeInConfig be given to MergeConfig or at least set so the call works.

Actual Behavior

MergeInConfig already validates the configuration file extension, but a further call toMergeConfig inside that method, checks for an already set configuration type and the call fails since there is none set.

Steps To Reproduce

See repl.it link

Additional Information

No response