diff --git a/src/Solver/Mage.py b/src/Solver/Mage.py
index 5a2c6698..8dd7dbf4 100644
--- a/src/Solver/Mage.py
+++ b/src/Solver/Mage.py
@@ -1282,7 +1282,7 @@ class Mage8(Mage):
             logger.info(f"compute river bed elevation...")
 
             for r in reachs:
-                z_min = reach.geometry.get_z_min()
+                z_min = r.geometry.get_z_min()
                 sls = list(map(
                     lambda p: p.get_ts_key(ts_list[0], "sl")[0],
                     r.profiles
diff --git a/src/View/MainWindow.py b/src/View/MainWindow.py
index c757a291..8e3b506d 100644
--- a/src/View/MainWindow.py
+++ b/src/View/MainWindow.py
@@ -1683,7 +1683,7 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
                     for key in ["Z", "Q", "V"]:
                         d1 = profile1.get_ts_key(timestamp, key)
                         d2 = profile2.get_ts_key(timestamp, key)
-                        d = d1-d2
+                        d = d1 - d2
                         reach3.set(p, timestamp, key, d)
                         reach4.set(p, timestamp, key, d1)
                         reach5.set(p, timestamp, key, d2)
@@ -1694,7 +1694,7 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
                         d2 = profile2.get_ts_key(timestamp, 'zfd')
                         reach5.set(p, timestamp, 'zfd', d2)
                         if reach1.has_bedload():
-                            d3 = d1-d2
+                            d3 = d1 - d2
                             reach3.set(p, timestamp, 'zfd', d3)
 
                     limits = reach3.profile(p).geometry.get_water_limits(