diff --git a/static/app/views/organizationStats/index.spec.tsx b/static/app/views/organizationStats/index.spec.tsx
index ae8b84701729..78239164e972 100644
--- a/static/app/views/organizationStats/index.spec.tsx
+++ b/static/app/views/organizationStats/index.spec.tsx
@@ -218,6 +218,25 @@ describe('OrganizationStats', () => {
     );
   });
 
+  it('defaults to errors when dataCategory does not support external stats', async () => {
+    // Categories like monitorSeats have showExternalStats=false and are absent from
+    // CHART_OPTIONS_DATACATEGORY. Passing them via the URL should fall back to errors
+    // rather than crashing the chart with "Selected item is not supported".
+    render(<OrganizationStats />, {
+      organization,
+      initialRouterConfig: {
+        location: {
+          pathname: '/organizations/org-slug/stats/',
+          query: {dataCategory: DATA_CATEGORY_INFO.monitor_seat.plural},
+        },
+      },
+    });
+
+    // Should render without throwing and default to the Errors category
+    expect(await screen.findByText('Project(s) Stats')).toBeInTheDocument();
+    expect(screen.getAllByText('Errors')[0]).toBeInTheDocument();
+  });
+
   it('does not leak query params onto next page links', async () => {
     render(<OrganizationStats />, {
       organization,
diff --git a/static/app/views/organizationStats/index.tsx b/static/app/views/organizationStats/index.tsx
index 2c915c178dc7..701c313cff60 100644
--- a/static/app/views/organizationStats/index.tsx
+++ b/static/app/views/organizationStats/index.tsx
@@ -75,7 +75,12 @@ export class OrganizationStatsInner extends Component<OrganizationStatsProps> {
     const dataCategoryPlural = this.props.location?.query?.dataCategory;
 
     const categories = Object.values(DATA_CATEGORY_INFO);
-    const info = categories.find(c => c.plural === dataCategoryPlural);
+    // Only consider categories that are shown in the usage chart (showExternalStats).
+    // Categories that don't have showExternalStats (e.g. monitorSeats) are not
+    // present in CHART_OPTIONS_DATACATEGORY and would cause a crash in UsageChart.
+    const info = categories.find(
+      c => c.plural === dataCategoryPlural && c.statsInfo.showExternalStats
+    );
 
     // Default to errors
     return info ?? DATA_CATEGORY_INFO.error;