diff --git a/image_prediction/image_extractor/extractors/parsable.py b/image_prediction/image_extractor/extractors/parsable.py
index 74488be..2c2f804 100644
--- a/image_prediction/image_extractor/extractors/parsable.py
+++ b/image_prediction/image_extractor/extractors/parsable.py
@@ -7,10 +7,13 @@ from itertools import chain, starmap, filterfalse
 from operator import itemgetter
 from typing import Iterable, Iterator, List, Union
 
+import IPython
 import fitz
 import numpy as np
 from PIL import Image
-from funcy import merge, compose, rcompose, keep
+from funcy import merge, compose, rcompose, keep, identity
+from pymonad.maybe import Maybe, Nothing, Just
+from pymonad.tools import curry
 
 from image_prediction.exceptions import InvalidBox, BadXref
 from image_prediction.formatter.formatters.enum import EnumFormatter
@@ -22,6 +25,8 @@ from image_prediction.utils import get_logger
 
 logger = get_logger()
 
+Maybe
+
 
 class ParsablePDFImageExtractor(ImageExtractor):
     def __init__(self, verbose=False, tolerance=0):
@@ -47,13 +52,19 @@ class ParsablePDFImageExtractor(ImageExtractor):
 
     def __process_images_on_page(self, page: fitz.fitz.Page):
         metadata = extract_valid_metadata(self.doc, page)
-        image_metadata_pairs = keep(partial(metadatum_to_image_metadata_pair, self.doc), metadata)
+
+        maybe_image_metadata_pairs = map(partial(metadatum_to_image_metadata_pair, self.doc), metadata)
+        image_metadata_pairs = [pair.value for pair in maybe_image_metadata_pairs if pair.is_just()]
+        print(image_metadata_pairs)
         clear_caches()
 
         #  TODO: In the future, consider to introduce an image validator as a pipeline component rather than doing the
         #   validation here. Invalid images can then be split into a different stream and joined with the intact images
         #   again for the formatting step.
         image_metadata_pairs = self.__filter_valid_images(image_metadata_pairs)
+        image_metadata_pairs = list(image_metadata_pairs)
+        print(image_metadata_pairs)
+
         image_metadata_pairs = stitch_pairs(list(image_metadata_pairs), tolerance=self.tolerance)
 
         yield from image_metadata_pairs
@@ -89,9 +100,9 @@ def extract_valid_metadata(doc: fitz.fitz.Document, page: fitz.fitz.Page):
     )(page)
 
 
-def metadatum_to_image_metadata_pair(doc, metadatum: dict):
+def metadatum_to_image_metadata_pair(doc, metadatum: dict) -> Maybe:
     maybe_image = xref_to_maybe_image(doc, metadatum[Info.XREF])
-    return make_maybe_image_metadata_pair(maybe_image, metadatum)
+    return make_maybe_image_metadata_pair(maybe_image, Just(metadatum))
 
 
 def add_alpha_channel_info(doc, metadata):
@@ -117,15 +128,19 @@ def get_metadata_for_images_on_page(page: fitz.Page):
 
 
 @lru_cache(maxsize=None)
-def xref_to_maybe_image(doc, xref) -> Union[Image.Image, None]:
+def xref_to_maybe_image(doc, xref) -> Maybe:
     try:
-        return extract_image(doc, xref)
+        return Just(extract_image(doc, xref))
     except BadXref:
-        return None
+        return Nothing
 
 
-def make_maybe_image_metadata_pair(image, metadata):
-    return ImageMetadataPair(image, metadata) if image and metadata else None
+def make_maybe_image_metadata_pair(image: Maybe, metadata: Maybe):
+    return Just(image.bind(curry(2, make_image_metadata_pair))).amap(metadata)
+
+
+def make_image_metadata_pair(image: Image.Image, metadatum: dict) -> Just:
+    return ImageMetadataPair(image, metadatum)
 
 
 def extract_image(doc, xref) -> Image.Image: