diff --git a/docs/release_notes/next/fix-2422-Add-roi-after-export b/docs/release_notes/next/fix-2422-Add-roi-after-export
new file mode 100644
index 00000000000..a0cb2b52765
--- /dev/null
+++ b/docs/release_notes/next/fix-2422-Add-roi-after-export
@@ -0,0 +1 @@
+2422: Spectrum viewer: Resolves a bug preventing a new ROI from being added after exporting to a CSV file
\ No newline at end of file
diff --git a/mantidimaging/gui/windows/spectrum_viewer/model.py b/mantidimaging/gui/windows/spectrum_viewer/model.py
index 5a86e30fab8..01ba063ddc9 100644
--- a/mantidimaging/gui/windows/spectrum_viewer/model.py
+++ b/mantidimaging/gui/windows/spectrum_viewer/model.py
@@ -310,17 +310,15 @@ def save_csv(self,
         csv_output = CSVOutput()
         csv_output.add_column("ToF_index", np.arange(self._stack.data.shape[0]), "Index")
 
-        self.tof_data = self.get_stack_time_of_flight()
-        if self.tof_data is not None:
-            self.units.set_data_to_convert(self.tof_data)
+        local_tof_data = self.get_stack_time_of_flight()
+        if local_tof_data is not None:
+            self.units.set_data_to_convert(local_tof_data)
             csv_output.add_column("Wavelength", self.units.tof_seconds_to_wavelength_in_angstroms(), "Angstrom")
             csv_output.add_column("ToF", self.units.tof_seconds_to_us(), "Microseconds")
             csv_output.add_column("Energy", self.units.tof_seconds_to_energy(), "MeV")
-
         for roi_name, roi in rois.items():
             csv_output.add_column(roi_name, self.get_spectrum(roi, SpecType.SAMPLE, normalise_with_shuttercount),
                                   "Counts")
-
             if normalise:
                 if self._normalise_stack is None:
                     raise RuntimeError("No normalisation stack selected")