Error in v-on handler: "TypeError: Cannot read properties of undefined (reading 'replace')"

This error occurs when you are trying to access a property of an undefined object in a v-on handler.

To fix this error, you need to check if the object exists before trying to access its properties.

For example, if you have a method that is trying to replace a string in an object:

methods: {
  replaceString(obj) {
    obj.name = obj.name.replace('old', 'new');
  }
}

You can add a check to make sure that obj exists before trying to access its properties:

methods: {
  replaceString(obj) {
    if (obj && obj.name) {
      obj.name = obj.name.replace('old', 'new');
    }
  }
}

This will prevent the error from occurring if obj is undefined.