diff --git a/apps/api/src/valkey/valkey.service.ts b/apps/api/src/valkey/valkey.service.ts
index 1c5f630..baadd4d 100644
--- a/apps/api/src/valkey/valkey.service.ts
+++ b/apps/api/src/valkey/valkey.service.ts
@@ -1,6 +1,6 @@
 import { Injectable, Logger, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
 import Redis from 'ioredis';
-import { TaskDto, TaskStatus, EnqueueTaskDto, UpdateTaskStatusDto, TaskMetadata } from './dto/task.dto';
+import { TaskDto, TaskStatus, EnqueueTaskDto, UpdateTaskStatusDto } from './dto/task.dto';
 import { randomUUID } from 'crypto';
 
 /**
@@ -15,7 +15,7 @@ import { randomUUID } from 'crypto';
 @Injectable()
 export class ValkeyService implements OnModuleInit, OnModuleDestroy {
   private readonly logger = new Logger(ValkeyService.name);
-  private client: Redis;
+  private client!: Redis;
   private readonly QUEUE_KEY = 'mosaic:task:queue';
   private readonly TASK_PREFIX = 'mosaic:task:';
   private readonly TASK_TTL = 86400; // 24 hours in seconds
@@ -55,7 +55,8 @@ export class ValkeyService implements OnModuleInit, OnModuleDestroy {
       await this.client.ping();
       this.logger.log('Valkey health check passed');
     } catch (error) {
-      this.logger.error('Valkey health check failed:', error.message);
+      const errorMessage = error instanceof Error ? error.message : String(error);
+      this.logger.error('Valkey health check failed:', errorMessage);
       throw error;
     }
   }
@@ -142,7 +143,8 @@ export class ValkeyService implements OnModuleInit, OnModuleDestroy {
     try {
       return JSON.parse(taskData) as TaskDto;
     } catch (error) {
-      this.logger.error(`Failed to parse task data for ${taskId}:`, error.message);
+      const errorMessage = error instanceof Error ? error.message : String(error);
+      this.logger.error(`Failed to parse task data for ${taskId}:`, errorMessage);
       return null;
     }
   }
@@ -222,7 +224,8 @@ export class ValkeyService implements OnModuleInit, OnModuleDestroy {
       const result = await this.client.ping();
       return result === 'PONG';
     } catch (error) {
-      this.logger.error('Valkey health check failed:', error.message);
+      const errorMessage = error instanceof Error ? error.message : String(error);
+      this.logger.error('Valkey health check failed:', errorMessage);
       return false;
     }
   }