diff --git a/client/public/locales/en/common.json b/client/public/locales/en/common.json
index 96b49e6..5bcc5a7 100644
--- a/client/public/locales/en/common.json
+++ b/client/public/locales/en/common.json
@@ -40,6 +40,7 @@
   },
   "loading": "Loading",
   "version": "Version",
+  "unknown": "Unknown",
   "tags": {
     "clone": "Clone"
   },
diff --git a/client/public/locales/sv/common.json b/client/public/locales/sv/common.json
index dc4a79d..31e76ae 100644
--- a/client/public/locales/sv/common.json
+++ b/client/public/locales/sv/common.json
@@ -40,6 +40,7 @@
   },
   "loading": "Laddar...",
   "version": "Version",
+  "unknown": "Okänd",
   "tags": {
     "clone": "Klona"
   },
diff --git a/client/src/components/column.tsx b/client/src/components/column.tsx
index 6fa4bc7..7677aec 100644
--- a/client/src/components/column.tsx
+++ b/client/src/components/column.tsx
@@ -87,6 +87,7 @@ export function FilteredColumn<Obj>(props: BaseColumnProps<Obj>) {
 interface NumberColumnProps<Obj> extends BaseColumnProps<Obj> {
   unit: string;
   decimals?: number;
+  defaultText?: string;
 }
 
 export function NumberColumn<Obj>(props: NumberColumnProps<Obj>) {
@@ -94,7 +95,7 @@ export function NumberColumn<Obj>(props: NumberColumnProps<Obj>) {
     ...props,
     render: (value) => {
       if (value === null || value === undefined) {
-        return <TextField value="Unknown" />;
+        return <TextField value={props.defaultText ?? ""} />;
       }
       return (
         <NumberFieldUnit
diff --git a/client/src/pages/spools/list.tsx b/client/src/pages/spools/list.tsx
index f254051..da5f869 100644
--- a/client/src/pages/spools/list.tsx
+++ b/client/src/pages/spools/list.tsx
@@ -204,6 +204,7 @@ export const SpoolList: React.FC<IResourceComponentsProps> = () => {
           i18ncat: "spool",
           unit: "g",
           decimals: 1,
+          defaultText: t("unknown"),
           dataSource,
           tableState,
         })}