diff --git a/pisa_utils/post_process_parsers.py b/pisa_utils/post_process_parsers.py
index 1174636..f4c6ead 100644
--- a/pisa_utils/post_process_parsers.py
+++ b/pisa_utils/post_process_parsers.py
@@ -19,9 +19,6 @@ def __init__(self, input_json_path, output_json_path, compressed=False):
         self.output_json_path = output_json_path
         self.compressed = compressed
 
-        with open_compressed(self.input_json_path, compressed=self.compressed) as f:
-            self.data = json.load(f)
-
     def save(self, path_json: str, data: dict) -> None:
         """
         Save data to JSON file, with optional gzip compression.
@@ -38,11 +35,14 @@ def save(self, path_json: str, data: dict) -> None:
 
     @abstractmethod
     def parse(self):
-        pass
+        with open_compressed(self.input_json_path, compressed=self.compressed) as f:
+            self.data = json.load(f)
 
 
 class PostProcessComplexTable(PostProcessor):
     def parse(self):
+        super().parse()
+
         output = []
 
         # Add ASU complex
diff --git a/pyproject.toml b/pyproject.toml
index 44d5056..e312b29 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "pisa-analysis"
-version = "3.2.0"
+version = "3.2.1"
 description = "This python package works with PISA to analyse data for macromolecular interfaces and interactions in assemblies."
 authors = [
     { name = "Grisell Diaz Leines", email = "gdiazleines@ebi.ac.uk" },
diff --git a/uv.lock b/uv.lock
index a3e05d9..a15ac4b 100644
--- a/uv.lock
+++ b/uv.lock
@@ -725,7 +725,7 @@ wheels = [
 
 [[package]]
 name = "pisa-analysis"
-version = "3.2.0"
+version = "3.2.1"
 source = { editable = "." }
 dependencies = [
     { name = "gemmi" },