diff --git a/src/utils/arweave.ts b/src/utils/arweave.ts
index ae1dae83..ee82daf4 100644
--- a/src/utils/arweave.ts
+++ b/src/utils/arweave.ts
@@ -22,5 +22,5 @@ export const validateArweaveId = (id: string): boolean => {
 };
 
 export function isBlockHeight(height: string | number): height is BlockHeight {
-  return height !== undefined;
+  return height !== undefined && !isNaN(parseInt(height.toString()))
 }