diff --git a/front/src/modules/timesStops/TimesStopsInput.tsx b/front/src/modules/timesStops/TimesStopsInput.tsx
index 49715c8c531..a617bf2c027 100644
--- a/front/src/modules/timesStops/TimesStopsInput.tsx
+++ b/front/src/modules/timesStops/TimesStopsInput.tsx
@@ -15,7 +15,7 @@ import {
   durationSinceStartTime,
   formatSuggestedViasToRowVias,
   onStopSignalToReceptionSignal,
-  preventUpdateOnNullableToNullable,
+  normalizeNullableInRow,
   updateDaySinceDeparture,
   updateRowTimesAndMargin,
 } from './helpers/utils';
@@ -114,7 +114,6 @@ const TimesStopsInput = ({ allWaypoints, startTime, pathSteps }: TimesStopsInput
         rows.length
       );
       updatedRows = updateDaySinceDeparture(updatedRows, startTime);
-      updatedRows = preventUpdateOnNullableToNullable(updatedRows, rows);
 
       if (!updatedRows[operation.fromRowIndex].isMarginValid) {
         newRows[operation.fromRowIndex].isMarginValid = false;
@@ -127,7 +126,10 @@ const TimesStopsInput = ({ allWaypoints, startTime, pathSteps }: TimesStopsInput
         setRows(newRows);
       } else {
         const newVias = updatedRows
-          .filter((row, index) => !isEqual(row, rows[index]))
+          .filter(
+            (row, index) =>
+              !isEqual(normalizeNullablesInRow(row), normalizeNullablesInRow(rows[index]))
+          )
           .map(({ shortSlipDistance, onStopSignal, arrival, departure, ...row }) => ({
             ...row,
             arrival: durationSinceStartTime(startTime, arrival),
diff --git a/front/src/modules/timesStops/helpers/utils.ts b/front/src/modules/timesStops/helpers/utils.ts
index b3662001810..fe9c132e1a7 100644
--- a/front/src/modules/timesStops/helpers/utils.ts
+++ b/front/src/modules/timesStops/helpers/utils.ts
@@ -1,7 +1,7 @@
 /* eslint-disable @typescript-eslint/no-use-before-define */
 import dayjs from 'dayjs';
 import type { TFunction } from 'i18next';
-import { round, isEqual, isNil } from 'lodash';
+import _, { round, isEqual, isNil } from 'lodash';
 import { keyColumn, createTextColumn } from 'react-datasheet-grid';
 
 import type { OperationalPointWithTimeAndSpeed } from 'applications/operationalStudies/types';
@@ -218,24 +218,18 @@ export function updateRowTimesAndMargin(
 }
 
 /**
- * This function prevent a change from undefined to null (or the reverse)
- * from being treated as an actual update of a row (otherwise would occur on deletion of an undefined field)
+ * This function is called before comparing rows to prevent a change from undefined to null (or the reverse)
+ * from being treated as an actual update of a row (otherwise changes would occur on deletion of an undefined field)
  */
-export function preventUpdateOnNullableToNullable(
-  newRowData: TimesStopsInputRow[],
-  previousRowData: TimesStopsInputRow[]
-): TimesStopsInputRow[] {
-  return newRowData.map((newRow, index) => {
-    const previousRow = previousRowData[index];
-    // == null is equivalent to === null || === undefined
-    if (newRow.stopFor == null && previousRow.stopFor == null) {
-      newRow.stopFor = previousRow.stopFor;
-    }
-    if (newRow.theoreticalMargin == null && previousRow.theoreticalMargin == null) {
-      newRow.theoreticalMargin = previousRow.theoreticalMargin;
-    }
-    return newRow;
-  });
+export function normalizeNullableInRow(row: TimesStopsInputRow): TimesStopsInputRow {
+  const normalizedRow = _.clone(row);
+  if (normalizedRow.stopFor === null) {
+    normalizedRow.stopFor = undefined;
+  }
+  if (normalizedRow.theoreticalMargin === null) {
+    normalizedRow.theoreticalMargin = undefined;
+  }
+  return normalizedRow;
 }
 
 /**