diff --git a/lib/insights/velocity.ts b/lib/insights/velocity.ts
index 528b321..7cf123e 100644
--- a/lib/insights/velocity.ts
+++ b/lib/insights/velocity.ts
@@ -33,7 +33,7 @@ export async function getVelocity(userId: string, sprintsBack = 5): Promise<Velo
   })
 
   // Reverse to chronological order (oldest first, for x-axis)
-  const chronological = [...sprints].reverse()
+  const chronological = [...sprints].filter(s => s.completed_at != null).reverse()
 
   const result: VelocitySprint[] = chronological.map(sprint => ({
     sprintId: sprint.id,
@@ -41,7 +41,7 @@ export async function getVelocity(userId: string, sprintsBack = 5): Promise<Velo
     productId: sprint.product.id,
     productName: sprint.product.name,
     doneCount: sprint.tasks.filter(t => t.status === 'DONE').length,
-    completedAt: sprint.completed_at!.toISOString(),
+    completedAt: sprint.completed_at.toISOString(),
   }))
 
   const seen = new Set<string>()