diff --git a/gempy_engine/API/interp_single/_interp_scalar_field.py b/gempy_engine/API/interp_single/_interp_scalar_field.py
index 00b0a4c..3c7c126 100644
--- a/gempy_engine/API/interp_single/_interp_scalar_field.py
+++ b/gempy_engine/API/interp_single/_interp_scalar_field.py
@@ -51,7 +51,7 @@ def interpolate_scalar_field(solver_input: SolverInput, options: InterpolationOp
     
     BackendTensor.pykeops_enabled = False
     match weights_cached:
-        case None:
+        case None :
             weights = _solve_and_store_weights(
                 solver_input=solver_input,
                 kernel_options=options.kernel_options,