while performing a mutation

{ Error: Variable '$data' expected value of type 'UserCreateInput!' but got: {"name":"Alice"}. Reason: 'password' Expected non-null value, found null. (line 1, column 11):
mutation ($data: UserCreateInput!) {
          ^
    at BatchedGraphQLClient.<anonymous> (PROJECT_PATH/node_modules/http-link-dataloader/src/BatchedGraphQLClient.ts:74:13)
    at step (PROJECT_PATH/node_modules/http-link-dataloader/dist/src/BatchedGraphQLClient.js:40:23)
    at Object.next PROJECT_PATH/node_modules/http-link-dataloader/dist/src/BatchedGraphQLClient.js:21:53)
    at fulfilled (PROJECT_PATH/node_modules/http-link-dataloader/dist/src/BatchedGraphQLClient.js:12:58)
    at process._tickCallback (internal/process/next_tick.js:68:7) result: { data: null, errors: [ [Object] ], status: 200 } }