diff --git a/selfprivacy_api/graphql/queries/monitoring.py b/selfprivacy_api/graphql/queries/monitoring.py
index 81ce16a..eab43b6 100644
--- a/selfprivacy_api/graphql/queries/monitoring.py
+++ b/selfprivacy_api/graphql/queries/monitoring.py
@@ -1,7 +1,9 @@
 import strawberry
 from typing import Optional
 from datetime import datetime
-from selfprivacy_api.utils.monitoring import MonitoringQueries, MonitoringResponse
+from selfprivacy_api.models.services import ServiceStatus
+from selfprivacy_api.services.prometheus import Prometheus
+from selfprivacy_api.utils.monitoring import MonitoringQueries, MonitoringQueryError, MonitoringResponse
 
 
 @strawberry.type
@@ -13,6 +15,9 @@ class Monitoring:
         end: Optional[datetime] = None,
         step: int = 60,
     ) -> MonitoringResponse:
+        if Prometheus().get_status() != ServiceStatus.ACTIVE:
+            return MonitoringQueryError(error="Prometheus is not running")
+
         return MonitoringQueries.disk_usage(start, end, step)
 
     @strawberry.field
@@ -22,6 +27,9 @@ class Monitoring:
         end: Optional[datetime] = None,
         step: int = 60,
     ) -> MonitoringResponse:
+        if Prometheus().get_status() != ServiceStatus.ACTIVE:
+            return MonitoringQueryError(error="Prometheus is not running")
+
         return MonitoringQueries.memory_usage(start, end, step)
 
     @strawberry.field
@@ -31,6 +39,9 @@ class Monitoring:
         end: Optional[datetime] = None,
         step: int = 60,
     ) -> MonitoringResponse:
+        if Prometheus().get_status() != ServiceStatus.ACTIVE:
+            return MonitoringQueryError(error="Prometheus is not running")
+
         return MonitoringQueries.cpu_usage(start, end, step)
 
     @strawberry.field
@@ -40,4 +51,7 @@ class Monitoring:
         end: Optional[datetime] = None,
         step: int = 60,
     ) -> MonitoringResponse:
+        if Prometheus().get_status() != ServiceStatus.ACTIVE:
+            return MonitoringQueryError(error="Prometheus is not running")
+
         return MonitoringQueries.cpu_usage(start, end, step)