diff --git a/CHANGES b/CHANGES
index 1b25e4b37..7db859da4 100644
--- a/CHANGES
+++ b/CHANGES
@@ -21,6 +21,7 @@ Bugs fixed
 * #5016: crashed when recommonmark.AutoStrictify is enabled
 * #5022: latex: crashed with docutils package provided by Debian/Ubuntu
 * #5009: latex: a label for table is vanished if table does not have a caption
+* #5048: crashed with numbered toctree
 
 Testing
 --------
diff --git a/sphinx/environment/collectors/toctree.py b/sphinx/environment/collectors/toctree.py
index c8b00c900..35f19b18a 100644
--- a/sphinx/environment/collectors/toctree.py
+++ b/sphinx/environment/collectors/toctree.py
@@ -165,13 +165,14 @@ class TocTreeCollector(EnvironmentCollector):
                 elif isinstance(subnode, addnodes.compact_paragraph):
                     numstack[-1] += 1
                     if depth > 0:
-                        number = tuple(numstack)
+                        number = list(numstack)
+                        secnums[subnode[0]['anchorname']] = tuple(numstack)
                     else:
                         number = None
-                    secnums[subnode[0]['anchorname']] = number
-                    subnode[0]['secnumber'] = list(number)
+                        secnums[subnode[0]['anchorname']] = None
+                    subnode[0]['secnumber'] = number
                     if titlenode:
-                        titlenode['secnumber'] = list(number)
+                        titlenode['secnumber'] = number
                         titlenode = None
                 elif isinstance(subnode, addnodes.toctree):
                     _walk_toctree(subnode, depth)
diff --git a/tests/test_toctree.py b/tests/test_toctree.py
index 42ec0ce89..e37862ae0 100644
--- a/tests/test_toctree.py
+++ b/tests/test_toctree.py
@@ -8,6 +8,8 @@
     :copyright: Copyright 2007-2018 by the Sphinx team, see AUTHORS.
     :license: BSD, see LICENSE for details.
 """
+import re
+
 import pytest
 
 
@@ -35,3 +37,12 @@ def test_singlehtml_toctree(app, status, warning):
         app.builder._get_local_toctree('index')
     except AttributeError:
         pytest.fail('Unexpected AttributeError in app.builder.fix_refuris')
+
+
+@pytest.mark.sphinx(testroot='toctree', srcdir="numbered-toctree")
+def test_numbered_toctree(app, status, warning):
+    # give argument to :numbered: option
+    index = (app.srcdir / 'index.rst').text()
+    index = re.sub(':numbered:.*', ':numbered: 1', index)
+    (app.srcdir / 'index.rst').write_text(index, encoding='utf-8')
+    app.builder.build_all()