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@@ -3,7 +3,8 @@ from .utilities import (prRed, prGreen, prPurple, prWhite,
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wrapRed, wrapGreen, wrapPurple, wrapWhite,
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wrapOrange,)
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from .utilities import init_connections, init_dependencies, get_link_in_out
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-from .base_definitions import SchemaUINode, custom_props_types, MantisNodeGroup, SchemaGroup, replace_types
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+from .base_definitions import (SchemaUINode, custom_props_types, \
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+ MantisNodeGroup, SchemaGroup, replace_types, GraphError)
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from .node_container_common import setup_custom_props_from_np
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# a class that solves Schema nodes
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from bpy.types import NodeGroupInput, NodeGroupOutput
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@@ -277,6 +278,8 @@ class SchemaSolver:
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def handle_link_from_constant_input(self, frame_mantis_nodes, ui_link, to_ui_node):
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incoming = self.constant_in[ui_link.from_socket.name]
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+ if incoming is None:
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+ raise GraphError (f"{self.node} is missing a required input: {ui_link.from_socket.name}")
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from_node = incoming.from_node
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to_name = get_link_in_out(ui_link)[1]
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to_node = frame_mantis_nodes[(*self.autogen_path_names, to_name+self.index_str())]
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