message: Previd should be a string
  Reviewers: arik
  Subscribers: ben
diff: @@ -362,9 +362,9 @@ Wallet.prototype.addresses = function(params, callback) {
  query.mine = !!params.mine;
  }
  - if (params.prevId) {
  - if (!_.isNumber(params.prevId)) {
  - throw new Error('invalid prevId argument, expecting number');
  + if (!_.isUndefined(params.prevId)) {
  + if (!_.isString(params.prevId)) {
  + throw new Error('invalid prevId argument, expecting string');
  }
  query.prevId = params.prevId;
  }
  