diff --git a/ui/litellm-dashboard/src/app/(dashboard)/usage/_components/components/EndpointUsage/EndpointUsage.tsx b/ui/litellm-dashboard/src/app/(dashboard)/usage/_components/components/EndpointUsage/EndpointUsage.tsx
index dcf248cee65..e748e4586e5 100644
--- a/ui/litellm-dashboard/src/app/(dashboard)/usage/_components/components/EndpointUsage/EndpointUsage.tsx
+++ b/ui/litellm-dashboard/src/app/(dashboard)/usage/_components/components/EndpointUsage/EndpointUsage.tsx
@@ -39,16 +39,17 @@ const EndpointUsage: React.FC<EndpointUsageProps> = ({ userSpendData }) => {
             api_key_breakdown: {},
           };
         }
-        aggregatedEndpoints[endpoint].metrics.spend += metrics.metrics.spend;
-        aggregatedEndpoints[endpoint].metrics.prompt_tokens += metrics.metrics.prompt_tokens;
-        aggregatedEndpoints[endpoint].metrics.completion_tokens += metrics.metrics.completion_tokens;
-        aggregatedEndpoints[endpoint].metrics.total_tokens += metrics.metrics.total_tokens;
-        aggregatedEndpoints[endpoint].metrics.api_requests += metrics.metrics.api_requests;
-        aggregatedEndpoints[endpoint].metrics.successful_requests += metrics.metrics.successful_requests || 0;
-        aggregatedEndpoints[endpoint].metrics.failed_requests += metrics.metrics.failed_requests || 0;
-        aggregatedEndpoints[endpoint].metrics.cache_read_input_tokens += metrics.metrics.cache_read_input_tokens || 0;
+        aggregatedEndpoints[endpoint].metrics.spend += metrics.metrics?.spend ?? 0;
+        aggregatedEndpoints[endpoint].metrics.prompt_tokens += metrics.metrics?.prompt_tokens ?? 0;
+        aggregatedEndpoints[endpoint].metrics.completion_tokens += metrics.metrics?.completion_tokens ?? 0;
+        aggregatedEndpoints[endpoint].metrics.total_tokens += metrics.metrics?.total_tokens ?? 0;
+        aggregatedEndpoints[endpoint].metrics.api_requests += metrics.metrics?.api_requests ?? 0;
+        aggregatedEndpoints[endpoint].metrics.successful_requests += (metrics.metrics?.successful_requests ?? 0) || 0;
+        aggregatedEndpoints[endpoint].metrics.failed_requests += (metrics.metrics?.failed_requests ?? 0) || 0;
+        aggregatedEndpoints[endpoint].metrics.cache_read_input_tokens +=
+          (metrics.metrics?.cache_read_input_tokens ?? 0) || 0;
         aggregatedEndpoints[endpoint].metrics.cache_creation_input_tokens +=
-          metrics.metrics.cache_creation_input_tokens || 0;
+          (metrics.metrics?.cache_creation_input_tokens ?? 0) || 0;
       });
     });
 
diff --git a/ui/litellm-dashboard/src/app/(dashboard)/usage/_components/components/EntityUsage/entityUsageAggregations.test.ts b/ui/litellm-dashboard/src/app/(dashboard)/usage/_components/components/EntityUsage/entityUsageAggregations.test.ts
new file mode 100644
index 00000000000..12ea830c4d1
--- /dev/null
+++ b/ui/litellm-dashboard/src/app/(dashboard)/usage/_components/components/EntityUsage/entityUsageAggregations.test.ts
@@ -0,0 +1,36 @@
+import { describe, expect, it } from "vitest";
+import { getGlobalTopKeys, getTopModels, getTopAgents } from "./entityUsageAggregations";
+import type { DailyData } from "@/components/UsagePage/types";
+
+const partialDay = {
+  date: "2026-09-01",
+  breakdown: {
+    models: { model: { metadata: {} } },
+    api_keys: { key: { metadata: { key_alias: "test key" } } },
+    entities: { agent: { metadata: { agent_name: "test agent" }, api_key_breakdown: {} } },
+  },
+} as unknown as DailyData;
+
+describe("partial breakdown metrics", () => {
+  it("defaults missing global-key metrics to zero", () => {
+    expect(getGlobalTopKeys([partialDay], 10)[0].spend).toBe(0);
+  });
+  it("defaults missing model metrics to zero", () => {
+    expect(getTopModels([partialDay], "models", 10)[0].tokens).toBe(0);
+  });
+  it("defaults missing agent metrics to zero", () => {
+    expect(getTopAgents([partialDay], 10)[0].spend).toBe(0);
+  });
+  it("still sums populated days after a partial day", () => {
+    const goodDay = {
+      ...partialDay,
+      breakdown: {
+        ...partialDay.breakdown,
+        api_keys: {
+          key: { metadata: { key_alias: "test key" }, metrics: { spend: 5 } },
+        },
+      },
+    } as unknown as DailyData;
+    expect(getGlobalTopKeys([partialDay, goodDay], 10)[0].spend).toBe(5);
+  });
+});
diff --git a/ui/litellm-dashboard/src/app/(dashboard)/usage/_components/components/EntityUsage/entityUsageAggregations.ts b/ui/litellm-dashboard/src/app/(dashboard)/usage/_components/components/EntityUsage/entityUsageAggregations.ts
index be9f44d0786..86847ade1aa 100644
--- a/ui/litellm-dashboard/src/app/(dashboard)/usage/_components/components/EntityUsage/entityUsageAggregations.ts
+++ b/ui/litellm-dashboard/src/app/(dashboard)/usage/_components/components/EntityUsage/entityUsageAggregations.ts
@@ -37,14 +37,14 @@ export const getTopModels = (
         };
       }
       try {
-        modelSpend[model].spend += metrics.metrics.spend;
+        modelSpend[model].spend += metrics.metrics?.spend ?? 0;
       } catch (e) {
         console.error(`Error adding spend for ${model}: ${e}, got metrics: ${JSON.stringify(metrics)}`);
       }
-      modelSpend[model].requests += metrics.metrics.api_requests;
-      modelSpend[model].successful_requests += metrics.metrics.successful_requests;
-      modelSpend[model].failed_requests += metrics.metrics.failed_requests;
-      modelSpend[model].tokens += metrics.metrics.total_tokens;
+      modelSpend[model].requests += metrics.metrics?.api_requests ?? 0;
+      modelSpend[model].successful_requests += metrics.metrics?.successful_requests ?? 0;
+      modelSpend[model].failed_requests += metrics.metrics?.failed_requests ?? 0;
+      modelSpend[model].tokens += metrics.metrics?.total_tokens ?? 0;
     });
   });
 
@@ -71,11 +71,11 @@ export const getTopAgents = (results: ExtendedDailyData[], topAgentsLimit: numbe
           agent_name: (data.metadata as any)?.agent_name || agentId,
         };
       }
-      agentSpend[agentId].spend += data.metrics.spend;
-      agentSpend[agentId].requests += data.metrics.api_requests;
-      agentSpend[agentId].successful_requests += data.metrics.successful_requests;
-      agentSpend[agentId].failed_requests += data.metrics.failed_requests;
-      agentSpend[agentId].tokens += data.metrics.total_tokens;
+      agentSpend[agentId].spend += data.metrics?.spend ?? 0;
+      agentSpend[agentId].requests += data.metrics?.api_requests ?? 0;
+      agentSpend[agentId].successful_requests += data.metrics?.successful_requests ?? 0;
+      agentSpend[agentId].failed_requests += data.metrics?.failed_requests ?? 0;
+      agentSpend[agentId].tokens += data.metrics?.total_tokens ?? 0;
     });
   });
 
@@ -115,15 +115,15 @@ export const getGlobalTopKeys = (results: DailyData[], topKeysLimit: number): To
           },
         };
       }
-      keySpend[key].metrics.spend += metrics.metrics.spend;
-      keySpend[key].metrics.prompt_tokens += metrics.metrics.prompt_tokens;
-      keySpend[key].metrics.completion_tokens += metrics.metrics.completion_tokens;
-      keySpend[key].metrics.total_tokens += metrics.metrics.total_tokens;
-      keySpend[key].metrics.api_requests += metrics.metrics.api_requests;
-      keySpend[key].metrics.successful_requests += metrics.metrics.successful_requests;
-      keySpend[key].metrics.failed_requests += metrics.metrics.failed_requests;
-      keySpend[key].metrics.cache_read_input_tokens += metrics.metrics.cache_read_input_tokens || 0;
-      keySpend[key].metrics.cache_creation_input_tokens += metrics.metrics.cache_creation_input_tokens || 0;
+      keySpend[key].metrics.spend += metrics.metrics?.spend ?? 0;
+      keySpend[key].metrics.prompt_tokens += metrics.metrics?.prompt_tokens ?? 0;
+      keySpend[key].metrics.completion_tokens += metrics.metrics?.completion_tokens ?? 0;
+      keySpend[key].metrics.total_tokens += metrics.metrics?.total_tokens ?? 0;
+      keySpend[key].metrics.api_requests += metrics.metrics?.api_requests ?? 0;
+      keySpend[key].metrics.successful_requests += metrics.metrics?.successful_requests ?? 0;
+      keySpend[key].metrics.failed_requests += metrics.metrics?.failed_requests ?? 0;
+      keySpend[key].metrics.cache_read_input_tokens += (metrics.metrics?.cache_read_input_tokens ?? 0) || 0;
+      keySpend[key].metrics.cache_creation_input_tokens += (metrics.metrics?.cache_creation_input_tokens ?? 0) || 0;
     });
   });
 
@@ -134,7 +134,7 @@ export const getGlobalTopKeys = (results: DailyData[], topKeysLimit: number): To
       user: metrics.metadata.user_email ?? metrics.metadata.user_id ?? null,
       key_exists: metrics.metadata.key_exists,
       tags: metrics.metadata.tags || [],
-      spend: metrics.metrics.spend,
+      spend: metrics.metrics?.spend ?? 0,
     }))
     .sort((a, b) => b.spend - a.spend)
     .slice(0, topKeysLimit);
@@ -148,7 +148,7 @@ export const getTopAPIKeys = (results: ExtendedDailyData[], topKeysLimit: number
     const tagDictionary = Object.keys(entities).reduce((acc: { [key: string]: TagUsage[] }, entity) => {
       const { api_key_breakdown } = entities[entity];
       Object.keys(api_key_breakdown).forEach((key) => {
-        const tagUsage = { tag: entity, usage: api_key_breakdown[key].metrics.spend };
+        const tagUsage = { tag: entity, usage: api_key_breakdown[key].metrics?.spend ?? 0 };
         if (acc[key]) {
           acc[key].push(tagUsage);
         } else {
@@ -181,15 +181,15 @@ export const getTopAPIKeys = (results: ExtendedDailyData[], topKeysLimit: number
           },
         };
       }
-      keySpend[key].metrics.spend += metrics.metrics.spend;
-      keySpend[key].metrics.prompt_tokens += metrics.metrics.prompt_tokens;
-      keySpend[key].metrics.completion_tokens += metrics.metrics.completion_tokens;
-      keySpend[key].metrics.total_tokens += metrics.metrics.total_tokens;
-      keySpend[key].metrics.api_requests += metrics.metrics.api_requests;
-      keySpend[key].metrics.successful_requests += metrics.metrics.successful_requests;
-      keySpend[key].metrics.failed_requests += metrics.metrics.failed_requests;
-      keySpend[key].metrics.cache_read_input_tokens += metrics.metrics.cache_read_input_tokens || 0;
-      keySpend[key].metrics.cache_creation_input_tokens += metrics.metrics.cache_creation_input_tokens || 0;
+      keySpend[key].metrics.spend += metrics.metrics?.spend ?? 0;
+      keySpend[key].metrics.prompt_tokens += metrics.metrics?.prompt_tokens ?? 0;
+      keySpend[key].metrics.completion_tokens += metrics.metrics?.completion_tokens ?? 0;
+      keySpend[key].metrics.total_tokens += metrics.metrics?.total_tokens ?? 0;
+      keySpend[key].metrics.api_requests += metrics.metrics?.api_requests ?? 0;
+      keySpend[key].metrics.successful_requests += metrics.metrics?.successful_requests ?? 0;
+      keySpend[key].metrics.failed_requests += metrics.metrics?.failed_requests ?? 0;
+      keySpend[key].metrics.cache_read_input_tokens += (metrics.metrics?.cache_read_input_tokens ?? 0) || 0;
+      keySpend[key].metrics.cache_creation_input_tokens += (metrics.metrics?.cache_creation_input_tokens ?? 0) || 0;
     });
   });
 
@@ -200,7 +200,7 @@ export const getTopAPIKeys = (results: ExtendedDailyData[], topKeysLimit: number
       user: metrics.metadata.user_email ?? metrics.metadata.user_id ?? null,
       key_exists: metrics.metadata.key_exists,
       tags: metrics.metadata.tags || [],
-      spend: metrics.metrics.spend,
+      spend: metrics.metrics?.spend ?? 0,
     }))
     .sort((a, b) => b.spend - a.spend)
     .slice(0, topKeysLimit);
@@ -223,11 +223,11 @@ export const getProviderSpend = (results: ExtendedDailyData[]): ProviderSpendRow
         };
       }
       try {
-        providerSpend[provider].spend += metrics.metrics.spend;
-        providerSpend[provider].requests += metrics.metrics.api_requests;
-        providerSpend[provider].successful_requests += metrics.metrics.successful_requests;
-        providerSpend[provider].failed_requests += metrics.metrics.failed_requests;
-        providerSpend[provider].tokens += metrics.metrics.total_tokens;
+        providerSpend[provider].spend += metrics.metrics?.spend ?? 0;
+        providerSpend[provider].requests += metrics.metrics?.api_requests ?? 0;
+        providerSpend[provider].successful_requests += metrics.metrics?.successful_requests ?? 0;
+        providerSpend[provider].failed_requests += metrics.metrics?.failed_requests ?? 0;
+        providerSpend[provider].tokens += metrics.metrics?.total_tokens ?? 0;
       } catch (e) {
         console.error(`Error processing provider ${provider}: ${e}`);
       }