diff --git a/pythonbpf/vmlinux_parser/dependency_node.py b/pythonbpf/vmlinux_parser/dependency_node.py
index a0e1d45..feebec3 100644
--- a/pythonbpf/vmlinux_parser/dependency_node.py
+++ b/pythonbpf/vmlinux_parser/dependency_node.py
@@ -240,28 +240,47 @@ class DependencyNode:
             size_of_field = ctypes.sizeof(processing_field.type)
             return size_of_field
         elif processing_field.type.__module__ == "vmlinux":
-            size_of_field: int = 0
             if processing_field.ctype_complex_type is not None:
                 if issubclass(processing_field.ctype_complex_type, ctypes.Array):
                     if processing_field.containing_type.__module__ == ctypes.__name__:
-                        size_of_field = (
-                            ctypes.sizeof(processing_field.containing_type)
-                            * processing_field.type_size
-                        )
+                        if (
+                            processing_field.containing_type is not None
+                            and processing_field.type_size is not None
+                        ):
+                            size_of_field = (
+                                ctypes.sizeof(processing_field.containing_type)
+                                * processing_field.type_size
+                            )
+                        else:
+                            raise RuntimeError(
+                                f"{processing_field} has no containing_type or type_size"
+                            )
                         return size_of_field
                     elif processing_field.containing_type.__module__ == "vmlinux":
-                        size_of_field = (
-                            size_of_containing_type * processing_field.type_size
-                        )
+                        if (
+                            size_of_containing_type is not None
+                            and processing_field.type_size is not None
+                        ):
+                            size_of_field = (
+                                size_of_containing_type * processing_field.type_size
+                            )
+                        else:
+                            raise RuntimeError(
+                                f"{processing_field} has no containing_type or type_size"
+                            )
                         return size_of_field
                 elif issubclass(processing_field.ctype_complex_type, ctypes._Pointer):
-                    return ctypes.sizeof(ctypes.pointer())
+                    return ctypes.sizeof(ctypes.c_void_p)
                 else:
                     raise NotImplementedError(
                         "This subclass of ctype not supported yet"
                     )
             else:
                 # search up pre-created stuff and get size
+                if size_of_containing_type is None:
+                    raise RuntimeError(
+                        f"Size of containing type {size_of_containing_type} is None"
+                    )
                 return size_of_containing_type
 
         else:
diff --git a/pythonbpf/vmlinux_parser/import_detector.py b/pythonbpf/vmlinux_parser/import_detector.py
index e314a35..972b1ff 100644
--- a/pythonbpf/vmlinux_parser/import_detector.py
+++ b/pythonbpf/vmlinux_parser/import_detector.py
@@ -1,6 +1,6 @@
 import ast
 import logging
-from typing import List, Tuple, Dict
+from typing import List, Tuple, Any
 import importlib
 import inspect
 
@@ -82,7 +82,7 @@ def vmlinux_proc(tree: ast.AST, module):
     # initialise dependency handler
     handler = DependencyHandler()
     # initialise assignment dictionary of name to type
-    assignments: Dict[str, type] = {}
+    assignments: dict[str, tuple[type, Any]] = {}
 
     if not import_statements:
         logger.info("No vmlinux imports found")
@@ -132,10 +132,16 @@ def vmlinux_proc(tree: ast.AST, module):
     return assignments
 
 
-def process_vmlinux_assign(node, module, assignments: Dict[str, type]):
+def process_vmlinux_assign(node, module, assignments: dict[str, tuple[type, Any]]):
     # Check if this is a simple assignment with a constant value
     if len(node.targets) == 1 and isinstance(node.targets[0], ast.Name):
         target_name = node.targets[0].id
         if isinstance(node.value, ast.Constant):
-            assignments[target_name] = node.value.value
-            logger.info(f"Added assignment: {target_name} = {node.value.value}")
+            assignments[target_name] = (type(node.value.value), node.value.value)
+            logger.info(
+                f"Added assignment: {target_name} = {node.value.value!r} of type {type(node.value.value)}"
+            )
+        else:
+            raise ValueError(f"Unsupported assignment type for {target_name}")
+    else:
+        raise ValueError("Not a simple assignment")