diff --git a/src/stratigraphy/line_detection.py b/src/stratigraphy/line_detection.py
index bc19a15c..411c4bd2 100644
--- a/src/stratigraphy/line_detection.py
+++ b/src/stratigraphy/line_detection.py
@@ -11,6 +11,7 @@
 
 from stratigraphy.util.dataclasses import Line
 from stratigraphy.util.geometric_line_utilities import (
+    deduplicate_lines,
     drop_vertical_lines,
     merge_parallel_lines_approximately,
     merge_parallel_lines_quadtree,
@@ -53,7 +54,9 @@ def detect_lines_lsd(page: fitz.Page, scale_factor=2, lsd_params=None) -> ArrayL
 
     # Detect lines in the image
     lines = lsd.detect(gray)[0]
-    return [line_from_array(line, scale_factor) for line in lines]
+    converted_lines = [line_from_array(line, scale_factor) for line in lines]
+    deduplicated_lines = deduplicate_lines(converted_lines)
+    return deduplicated_lines
 
 
 def extract_lines(page: fitz.Page, line_detection_params: dict) -> list[Line]:
diff --git a/src/stratigraphy/util/dataclasses.py b/src/stratigraphy/util/dataclasses.py
index a9b1eb26..c8f0c7ef 100644
--- a/src/stratigraphy/util/dataclasses.py
+++ b/src/stratigraphy/util/dataclasses.py
@@ -71,13 +71,6 @@ def remove(self, line_index: str):
             del self.hashmap[line_index]
 
     def add(self, line: Line) -> str:
-        if not self._check_if_present(line):
-            key = uuid.uuid4().hex
-            self.hashmap[key] = line
-            return key
-        else:
-            logger.warning("Line already present in IndexedLines.")
-            return None
-
-    def _check_if_present(self, line: Line) -> bool:
-        return any(value.start == line.start and value.end == line.end for _key, value in self.hashmap.items())
+        key = uuid.uuid4().hex
+        self.hashmap[key] = line
+        return key
diff --git a/src/stratigraphy/util/geometric_line_utilities.py b/src/stratigraphy/util/geometric_line_utilities.py
index 4e5cdb58..4c9bd877 100644
--- a/src/stratigraphy/util/geometric_line_utilities.py
+++ b/src/stratigraphy/util/geometric_line_utilities.py
@@ -21,6 +21,26 @@
 sys.setrecursionlimit(10000)  # required for the quadtree
 
 
+def deduplicate_lines(lines: list[Line]) -> list[Line]:
+    """Deduplicate lines by merging lines that are close to each other.
+
+    Args:
+        lines (list[Line]): The lines to deduplicate.
+
+    Returns:
+        list[Line]: The deduplicated lines.
+    """
+    deduplicated_lines = []
+    for line in lines:
+        if not _check_if_present(deduplicated_lines, line):
+            deduplicated_lines.append(line)
+    return deduplicated_lines
+
+
+def _check_if_present(lines, line: Line) -> bool:
+    return any(value.start == line.start and value.end == line.end for value in lines)
+
+
 def drop_vertical_lines(lines: list[Line], threshold: float = 0.1) -> ArrayLike:
     """Given a list of lines, remove the lines that are close to vertical.
 
@@ -456,7 +476,6 @@ def merge_parallel_lines_quadtree(lines: list[Line], tol: int, angle_threshold:
                             merged_any = True
                         continue
     if merged_any:
-        print("Starting recursion.")
         return merge_parallel_lines_quadtree(
             list(indexed_lines.hashmap.values()), tol=tol, angle_threshold=angle_threshold
         )