[dashboard] Guard memoryConverter against null/undefined/NaN from psutil stats

python/ray/dashboard/client/src/util/converter.ts

@@ -1,4 +1,12 @@
-export const memoryConverter = (bytes: number) => {
+export const memoryConverter = (bytes: number | undefined | null) => {
+  // The reporter agent serializes psutil process stats via as_dict(), which
+  // yields null for fields psutil cannot read (e.g. pfaults/pageins on some
+  // platforms, or when AccessDenied is raised). Guard against null/undefined
+  // /NaN so the Worker table keeps rendering instead of crashing on `.toFixed`.
+  if (typeof bytes !== "number" || Number.isNaN(bytes)) {
+    return "-";
+  }
+
   if (bytes < 1024) {
     return `${bytes.toFixed(4)}B`;
   }

python/ray/dashboard/client/src/util/converter.unit.test.ts

@@ -37,4 +37,24 @@ describe("memoryConverter", () => {
   test.each(table)("$name", ({ input, expected }) => {
     expect(memoryConverter(input)).toEqual(expected);
   });
+
+  // The reporter agent serializes psutil process stats with as_dict(), which
+  // emits null for fields that psutil cannot read (e.g. pfaults/pageins on
+  // some platforms or when AccessDenied is raised). memoryConverter must not
+  // crash on null/undefined/NaN, otherwise the Worker table fails to render.
+  // See: https://github.com/ray-project/ray/issues (Cannot read properties of
+  // null (reading 'toFixed') at converter.ts)
+  describe("edge cases", () => {
+    test("returns '-' for null", () => {
+      expect(memoryConverter(null)).toEqual("-");
+    });
+
+    test("returns '-' for undefined", () => {
+      expect(memoryConverter(undefined)).toEqual("-");
+    });
+
+    test("returns '-' for NaN", () => {
+      expect(memoryConverter(NaN)).toEqual("-");
+    });
+  });
 });