diff --git a/pyphare/pyphare/pharesee/hierarchy.py b/pyphare/pyphare/pharesee/hierarchy.py
index a1c254036..2fe59e789 100644
--- a/pyphare/pyphare/pharesee/hierarchy.py
+++ b/pyphare/pyphare/pharesee/hierarchy.py
@@ -746,10 +746,10 @@ def global_min(self, qty, **kwargs):
             for patch in lvl.patches:
                 pd = patch.patch_datas[qty]
                 if first:
-                    m = pd.dataset[:].min()
+                    m = np.nanmin(pd.dataset[:])
                     first = False
                 else:
-                    m = min(m, pd.dataset[:].min())
+                    m = min(m, np.nanmin(pd.dataset[:]))
 
         return m
 
@@ -760,10 +760,10 @@ def global_max(self, qty, **kwargs):
             for patch in lvl.patches:
                 pd = patch.patch_datas[qty]
                 if first:
-                    m = pd.dataset[:].max()
+                    m = np.nanmax(pd.dataset[:])
                     first = False
                 else:
-                    m = max(m, pd.dataset[:].max())
+                    m = max(m, np.nanmax(pd.dataset[:]))
 
         return m