diff --git a/kpi_dashboard/models/kpi_dashboard.py b/kpi_dashboard/models/kpi_dashboard.py
index bdfb3683..5751f3ec 100644
--- a/kpi_dashboard/models/kpi_dashboard.py
+++ b/kpi_dashboard/models/kpi_dashboard.py
@@ -92,7 +92,9 @@ class KpiDashboardItem(models.Model):
 
     name = fields.Char(required=True)
     kpi_id = fields.Many2one("kpi.kpi")
-    dashboard_id = fields.Many2one("kpi.dashboard", required=True,)
+    dashboard_id = fields.Many2one(
+        "kpi.dashboard", required=True, ondelete="cascade"
+    )
     column = fields.Integer(required=True, default=1)
     row = fields.Integer(required=True, default=1)
     end_row = fields.Integer(store=True, compute='_compute_end_row')
diff --git a/kpi_dashboard_altair/models/kpi_kpi.py b/kpi_dashboard_altair/models/kpi_kpi.py
index db36e47c..b0d37508 100644
--- a/kpi_dashboard_altair/models/kpi_kpi.py
+++ b/kpi_dashboard_altair/models/kpi_kpi.py
@@ -8,7 +8,7 @@ try:
     import pandas
     import altair
 except ImportError:
-    logger.debug('Cannot import genshi.core')
+    logger.debug('Cannot import altair or pandas')
 
 
 class KpiKpi(models.Model):