diff --git a/docling/backend/pypdfium2_backend.py b/docling/backend/pypdfium2_backend.py
index bacc4a99..bd3b1b7c 100644
--- a/docling/backend/pypdfium2_backend.py
+++ b/docling/backend/pypdfium2_backend.py
@@ -229,10 +229,10 @@ class PyPdfiumPageBackend(PdfPageBackend):
                     b=max(cell.rect.to_bounding_box().b for cell in group),
                 )
 
-                assert self._ppage is not None
-                self.text_page = self._ppage.get_textpage()
+                assert self.text_page is not None
                 bbox = merged_bbox.to_bottom_left_origin(page_size.height)
-                merged_text = self.text_page.get_text_bounded(*bbox.as_tuple())
+                with pypdfium2_lock:
+                    merged_text = self.text_page.get_text_bounded(*bbox.as_tuple())
 
                 return TextCell(
                     index=group[0].index,
@@ -255,9 +255,9 @@ class PyPdfiumPageBackend(PdfPageBackend):
     def get_bitmap_rects(self, scale: float = 1) -> Iterable[BoundingBox]:
         AREA_THRESHOLD = 0  # 32 * 32
         page_size = self.get_size()
-        rotation = self._ppage.get_rotation()
 
         with pypdfium2_lock:
+            rotation = self._ppage.get_rotation()
             for obj in self._ppage.get_objects(filter=[pdfium_c.FPDF_PAGEOBJ_IMAGE]):
                 pos = obj.get_pos()
                 if rotation == 90:
diff --git a/tests/test_threaded_pipeline.py b/tests/test_threaded_pipeline.py
index ec6d3427..5810565c 100644
--- a/tests/test_threaded_pipeline.py
+++ b/tests/test_threaded_pipeline.py
@@ -5,6 +5,7 @@ from typing import List
 
 import pytest
 
+from docling.backend.pypdfium2_backend import PyPdfiumDocumentBackend
 from docling.datamodel.base_models import ConversionStatus, InputFormat
 from docling.datamodel.document import ConversionResult
 from docling.datamodel.pipeline_options import (
@@ -171,6 +172,27 @@ def test_pipeline_comparison():
     assert len(sync_doc.texts) == len(threaded_doc.texts)
 
 
+def test_pypdfium_threaded_pipeline():
+    doc_converter = (
+        DocumentConverter(  # all of the below is optional, has internal defaults.
+            format_options={
+                InputFormat.PDF: PdfFormatOption(
+                    pipeline_cls=ThreadedStandardPdfPipeline,
+                    backend=PyPdfiumDocumentBackend,
+                ),
+            },
+        )
+    )
+
+    test_file = "tests/data/pdf/2206.01062.pdf"
+    for i in range(6):
+        print(f"iteration {i=}")
+        conv_result = doc_converter.convert(test_file)
+        assert conv_result.status == ConversionStatus.SUCCESS
+        print(f"[{i=}] Success")
+    print("All done!")
+
+
 if __name__ == "__main__":
     # Run basic performance test
     test_pipeline_comparison()