diff --git a/nomad-front-end/src/store/reducers/NMRium.js b/nomad-front-end/src/store/reducers/NMRium.js
index 1453939..a1ad522 100644
--- a/nomad-front-end/src/store/reducers/NMRium.js
+++ b/nomad-front-end/src/store/reducers/NMRium.js
@@ -1,14 +1,15 @@
 import { Modal } from 'antd'
 import * as actionTypes from '../actions/actionTypes'
+import { nmriumDataVersion } from '../../utils/nmriumUtils'
 
 import history from '../../utils/history'
 
 const initialState = {
   nmriumState: {
     data: { spectra: [] },
-    version: 7
+    version: nmriumDataVersion
   },
-  changedData: { data: { spectra: [] }, version: 7 },
+  changedData: { data: { spectra: [] }, version: nmriumDataVersion },
   spinning: false,
   adding: false,
   showFidsModal: false,
@@ -72,8 +73,8 @@ const reducer = (state = initialState, { type, payload }) => {
     case actionTypes.RESET_NMRIUM_DATA:
       return {
         ...state,
-        nmriumState: { data: { spectra: [] }, version: 7 },
-        changedData: { data: { spectra: [] }, version: 7 },
+        nmriumState: { data: { spectra: [] }, version: nmriumDataVersion },
+        changedData: { data: { spectra: [] }, version: nmriumDataVersion },
         datasetMeta: { id: null }
       }
 
diff --git a/nomad-front-end/src/utils/nmriumUtils.js b/nomad-front-end/src/utils/nmriumUtils.js
index f722679..58b8a88 100644
--- a/nomad-front-end/src/utils/nmriumUtils.js
+++ b/nomad-front-end/src/utils/nmriumUtils.js
@@ -11,3 +11,5 @@ export const skimNMRiumdata = input => {
   delete output.view
   return output
 }
+
+export const nmriumDataVersion = 7
diff --git a/nomad-rest-api/controllers/data.js b/nomad-rest-api/controllers/data.js
index 1f90ec4..2ae8b45 100644
--- a/nomad-rest-api/controllers/data.js
+++ b/nomad-rest-api/controllers/data.js
@@ -12,7 +12,7 @@ import Group from '../models/group.js'
 import User from '../models/user.js'
 import Instrument from '../models/instrument.js'
 import { getIO } from '../socket.js'
-import { getNMRiumDataObj } from '../utils/nmriumUtils.js'
+import { getNMRiumDataObj, nmriumDataVersion } from '../utils/nmriumUtils.js'
 import { getGrantInfo } from '../utils/accountsUtils.js'
 
 export const postData = async (req, res) => {
@@ -123,7 +123,7 @@ export const getNMRium = async (req, res) => {
   const expIds = req.query.exps.split(',')
   const { dataType } = req.query
 
-  let responseData = { version: 7, data: { spectra: [] } }
+  let responseData = { version: nmriumDataVersion, data: { spectra: [] } }
 
   try {
     await Promise.all(
@@ -320,7 +320,7 @@ export const getExpsFromDatasets = async (req, res) => {
       })
     )
 
-    const responseData = { version: 7, data: { spectra: newSpectraArray } }
+    const responseData = { version: nmriumDataVersion, data: { spectra: newSpectraArray } }
 
     const respDataJSON = JSON.stringify(responseData, (k, v) =>
       ArrayBuffer.isView(v) ? Array.from(v) : v
diff --git a/nomad-rest-api/controllers/datasets.js b/nomad-rest-api/controllers/datasets.js
index 3e23f32..7d66e29 100644
--- a/nomad-rest-api/controllers/datasets.js
+++ b/nomad-rest-api/controllers/datasets.js
@@ -11,7 +11,7 @@ import Dataset from '../models/dataset.js'
 import Experiment from '../models/experiment.js'
 import ManualExperiment from '../models/manualExperiment.js'
 import Collection from '../models/collection.js'
-import { getNMRiumDataObj } from '../utils/nmriumUtils.js'
+import { getNMRiumDataObj, nmriumDataVersion } from '../utils/nmriumUtils.js'
 import zipDataset from '../utils/zipDataset.js'
 
 export const postDataset = async (req, res) => {
@@ -79,6 +79,14 @@ export const getDataset = async (req, res) => {
 
         i.data = nmriumDataObj.spectra[0].data
         i.meta = nmriumDataObj.spectra[0].meta
+
+        //contourOptions stored in DB by older NMRium is not compatible with version 7 data format
+        // if deleted NMRium generates contours from scratch like for freshly parsed experiments
+
+        if (i.display.dimension === 2 && dataset.nmriumData.version < 7) {
+          delete i.display.contourOptions
+        }
+
         return Promise.resolve(i)
       })
     )
@@ -96,7 +104,8 @@ export const getDataset = async (req, res) => {
       nmriumData: dataset.nmriumData
     }
 
-    respObj.nmriumData.version = 7
+    //version of NMRium data format has to be in sync with nmr-load-save parser
+    respObj.nmriumData.version = nmriumDataVersion
 
     const respJSON = JSON.stringify(respObj, (k, v) => (ArrayBuffer.isView(v) ? Array.from(v) : v))
     //.json can't be used as we already convert object to json above using custom function
diff --git a/nomad-rest-api/utils/nmriumUtils.js b/nomad-rest-api/utils/nmriumUtils.js
index 6b53679..5741fac 100644
--- a/nomad-rest-api/utils/nmriumUtils.js
+++ b/nomad-rest-api/utils/nmriumUtils.js
@@ -14,9 +14,11 @@ export const getNMRiumDataObj = async (dataPath, title, fid) => {
     const nmriumObj = await read(fileCollection)
 
     //If nmr-load-save is updated you can check version of nmrium object here
-    // and then update data.js controller and NMRium.js reducer in frontend
+
     //console.log(nmriumObj)
 
+    //then update nmriumDataVersion export from this file and also frontend nmriumUtils file
+
     const newSpectraArr = nmriumObj.nmriumState.data.spectra
       .filter(i => (fid ? !i.info.isFt : i.info.isFt))
       .map(i => {
@@ -26,6 +28,7 @@ export const getNMRiumDataObj = async (dataPath, title, fid) => {
       })
 
     nmriumObj.nmriumState.data.spectra = [...newSpectraArr]
+
     return Promise.resolve(nmriumObj.nmriumState.data)
   } catch (error) {
     Promise.reject(error)
@@ -57,3 +60,5 @@ export const validateNMRiumData = input => {
     })
   )
 }
+
+export const nmriumDataVersion = 7