diff --git a/src/cfgnet/plugins/file_type/json_plugin.py b/src/cfgnet/plugins/file_type/json_plugin.py
index 1a84ee8..5dcee67 100644
--- a/src/cfgnet/plugins/file_type/json_plugin.py
+++ b/src/cfgnet/plugins/file_type/json_plugin.py
@@ -127,7 +127,6 @@ def _parse_json_object(
             if not isinstance(parent, ArtifactNode):
                 name = json_object
                 value = ValueNode(name=name)
-
                 parent.add_child(value)
 
     @staticmethod
@@ -139,5 +138,8 @@ def _get_line_number(lines_dict: Dict, name: str) -> str:
         :param: name: name of option
         :return: line number of option
         """
-        line = next(filter(lambda x: f'"{name}"' in x, lines_dict.keys()))
-        return lines_dict[line]
+        try:
+            line = next(filter(lambda x: f'"{name}"' in x, lines_dict.keys()))
+            return lines_dict[line]
+        except StopIteration:
+            return "None"