Fixed python dict access

python/lbmpy_walberla/walberla_lbm_generation.py

@@ -134,15 +134,15 @@ def generate_lattice_model(generation_context, class_name, collision_rule, field
     q = len(lb_method.stencil)
     dim = lb_method.dim
 
+    create_kernel_params = default_create_kernel_parameters(generation_context, create_kernel_params)
+    if create_kernel_params['target'] == 'gpu':
+        raise ValueError("Lattice Models can only be generated for CPUs. To generate LBM on GPUs use sweeps directly")
+
     if field_layout == 'fzyx':
         create_kernel_params['cpu_vectorize_info']['assume_inner_stride_one'] = True
     elif field_layout == 'zyxf':
         create_kernel_params['cpu_vectorize_info']['assume_inner_stride_one'] = False
 
-    create_kernel_params = default_create_kernel_parameters(generation_context, create_kernel_params)
-    if create_kernel_params['target'] == 'gpu':
-        raise ValueError("Lattice Models can only be generated for CPUs. To generate LBM on GPUs use sweeps directly")
-
     src_field = ps.Field.create_generic('pdfs', dim, dtype, index_dimensions=1, layout=field_layout, index_shape=(q,))
     dst_field = ps.Field.create_generic('pdfs_tmp', dim, dtype, index_dimensions=1, layout=field_layout, index_shape=(q,))