Fix error handling in acceleration data polling

backend/src/repositories/BlocksRepository.ts

@@ -478,7 +478,7 @@ class BlocksRepository {
   public async $getBlocksByPool(slug: string, startHeight?: number): Promise<BlockExtended[]> {
     const pool = await PoolsRepository.$getPool(slug);
     if (!pool) {
-      throw new Error('This mining pool does not exist ' + escape(slug));
+      throw new Error('This mining pool does not exist');
     }
 
     const params: any[] = [];