diff --git a/src/converter/base.py b/src/converter/base.py
index f446f6e..68da73b 100644
--- a/src/converter/base.py
+++ b/src/converter/base.py
@@ -2,6 +2,7 @@
 from sketchformat.layer_common import *
 from sketchformat.layer_shape import *
 from sketchformat.style import *
+from .errors import *
 from typing import TypedDict
 
 from . import positioning, style, prototype, utils
diff --git a/src/converter/context.py b/src/converter/context.py
index 862f55f..ea2b3bf 100644
--- a/src/converter/context.py
+++ b/src/converter/context.py
@@ -1,6 +1,7 @@
 import logging
 from urllib.error import HTTPError
 from . import component, page, font
+from .errors import Fig2SketchWarning
 from sketchformat.document import Swatch
 from typing import Sequence, Tuple, Optional, Dict, IO, List
 
@@ -59,7 +60,10 @@ def add_symbol(self, sketch_symbol):
         self._position_symbol(sketch_symbol)
 
     def fig_node(self, fid: Sequence[int]) -> dict:
-        return self._node_by_id[fid]
+        if fid in self._node_by_id:
+            return self._node_by_id[fid]
+        else:
+            raise Fig2SketchWarning("NOD001")
 
     def record_font(self, fig_font_name):
         font_descriptor = (fig_font_name["family"], fig_font_name["style"])
diff --git a/src/converter/prototype.py b/src/converter/prototype.py
index 01c65e8..6390fa0 100644
--- a/src/converter/prototype.py
+++ b/src/converter/prototype.py
@@ -1,5 +1,5 @@
 from .context import context
-from .errors import Fig2SketchWarning
+from .errors import *
 from converter import utils
 from sketchformat.prototype import *
 from typing import TypedDict, Tuple, Optional