diff --git a/src/Model/Results/River/River.py b/src/Model/Results/River/River.py
index 6b926503..9f63a6ac 100644
--- a/src/Model/Results/River/River.py
+++ b/src/Model/Results/River/River.py
@@ -79,7 +79,8 @@ class Profile(SQLSubModel):
 
                 # If is a generator, compute value(s)
                 if isinstance(v, types.GeneratorType):
-                    v = self._data[timestamp][key] = next(v)
+                    v = next(v)
+                    self._data[timestamp][key] = v
 
                 return v