fix search block

src/pages/block/[hash].tsx

@@ -62,7 +62,7 @@ function Block(props: BlockProps) {
 
     useEffect(() => {
         async function fetchHash() {
-            if (!height) return;
+            if (height === null) return;
             const prevHashFetched = await Fetch.getHashByHeight(height - 1);
             const nextHashFetched = await Fetch.getHashByHeight(height + 1);
             setPrevHash(prevHashFetched);

src/utils/methods.ts

@@ -42,6 +42,8 @@ class Fetch {
     }
 
     static async getHashByHeight(height: number): Promise<string | null> {
+        if (height === -1) return "";
+        
         const result = await this.getBlockDetails(height, 1);
         if (result.success === false) return null;
         if (!(result instanceof Array)) return null;