diff --git a/doc/news/OSW-1047.bugfix.rst b/doc/news/OSW-1047.bugfix.rst
new file mode 100644
index 0000000..ec6d370
--- /dev/null
+++ b/doc/news/OSW-1047.bugfix.rst
@@ -0,0 +1 @@
+Fix bug in Data Log's psf median column.
\ No newline at end of file
diff --git a/src/pages/data-log.jsx b/src/pages/data-log.jsx
index 2677a25..f8f353d 100644
--- a/src/pages/data-log.jsx
+++ b/src/pages/data-log.jsx
@@ -115,12 +115,13 @@ function DataLog() {
             const pixelScale = !isNaN(entry.pixel_scale_median)
               ? entry.pixel_scale_median
               : DEFAULT_PIXEL_SCALE_MEDIAN;
+            const psf_median = !isNaN(psfSigma)
+              ? psfSigma * PSF_SIGMA_FACTOR * pixelScale
+              : null;
 
             return {
               ...normalisedEntry,
-              "psf median": !isNaN(psfSigma)
-                ? psfSigma * PSF_SIGMA_FACTOR * pixelScale
-                : null,
+              psf_median,
             };
           })
           .sort((a, b) => Number(b["exposure id"]) - Number(a["exposure id"]));