diff --git a/pdfplumber/page.py b/pdfplumber/page.py
index d9bec5e..b028065 100644
--- a/pdfplumber/page.py
+++ b/pdfplumber/page.py
@@ -270,7 +270,7 @@ class Page(Container):
         and positioning (within `tolerance`) as other characters on the page.
         """
         p = FilteredPage(self, True)
-        p._objects = dict((kind, objs) for kind, objs in self._objects.items())
+        p._objects = dict((kind, objs) for kind, objs in self.objects.items())
         p._objects["char"] = utils.dedupe_chars(self.chars, **kwargs)
         return p
 
diff --git a/tests/pdfs/issue-71-duplicate-chars-2.pdf b/tests/pdfs/issue-71-duplicate-chars-2.pdf
new file mode 100644
index 0000000..9cd3da5
Binary files /dev/null and b/tests/pdfs/issue-71-duplicate-chars-2.pdf differ
diff --git a/tests/test_dedupe_chars.py b/tests/test_dedupe_chars.py
index 82b87f7..48f69cd 100644
--- a/tests/test_dedupe_chars.py
+++ b/tests/test_dedupe_chars.py
@@ -67,3 +67,10 @@ class Test(unittest.TestCase):
 
         assert last_line_without_drop == '微微软软 培培训训课课程程：：  名名模模意意义义一一些些有有意意义义一一些些'
         assert last_line_with_drop == '微软 培训课程： 名模意义一些有意义一些'
+
+    def test_extract_text2(self):
+        path = os.path.join(HERE, "pdfs/issue-71-duplicate-chars-2.pdf")
+        pdf = pdfplumber.open(path)
+        page = pdf.pages[0]
+
+        assert page.dedupe_chars().extract_text(y_tolerance=6).splitlines()[4] == "UE 8.  Circulation - Métabolismes"