only loop over bcs if there are any

firedrakeproject · Apr 25, 2024 · 4d50879 · 4d50879
1 parent a74740f
commit 4d50879
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/firedrake/variational_solver.py b/firedrake/variational_solver.py
@@ -77,9 +77,10 @@ def __init__(self, F, u, bcs=None, J=None,
         self.J = J or ufl_expr.derivative(F, u)
         self.F = F
         self.Jp = Jp
-        for bc in bcs:
-            if isinstance(bc, EquationBC):
-                restrict = False
+        if bcs:
+            for bc in bcs:
+                if isinstance(bc, EquationBC):
+                    restrict = False
         self.restrict = restrict
 
         if restrict and bcs: