diff --git a/news/48.bugfix.md b/news/48.bugfix.md
new file mode 100644
index 00000000..76fb1984
--- /dev/null
+++ b/news/48.bugfix.md
@@ -0,0 +1 @@
+Converted non-string table cells to strings during rendering.
diff --git a/src/cleo/ui/table.py b/src/cleo/ui/table.py
index 7865b34a..e7b8c8a9 100644
--- a/src/cleo/ui/table.py
+++ b/src/cleo/ui/table.py
@@ -421,6 +421,10 @@ def _build_table_rows(self, rows: Rows) -> Iterator[Row | TableSeparator]:
 
             # Remove any new line breaks and replace it with a new line
             for column, cell in enumerate(rows[row_key]):
+                if not isinstance(cell, str):
+                    cell = str(cell)
+                    rows[row_key][column] = cell
+
                 colspan = cell.colspan if isinstance(cell, TableCell) else 1
 
                 if column in self._column_max_widths and self._column_max_widths[
diff --git a/tests/ui/test_table.py b/tests/ui/test_table.py
index d10b60c2..c250b390 100644
--- a/tests/ui/test_table.py
+++ b/tests/ui/test_table.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from typing import TYPE_CHECKING
+from typing import cast
 
 import pytest
 
@@ -428,6 +429,24 @@ def test_render(
     assert io.fetch_output() == expected
 
 
+def test_render_non_string_cells(io: BufferedIO) -> None:
+    table = Table(io)
+    table.set_headers(["Value", "Detail"])
+    table.set_rows(cast("Rows", [[None, 12], [False, "ready"]]))
+
+    table.render()
+
+    expected = """\
++-------+--------+
+| Value | Detail |
++-------+--------+
+| None  | 12     |
+| False | ready  |
++-------+--------+
+"""
+    assert io.fetch_output() == expected
+
+
 def test_column_style(io: BufferedIO) -> None:
     table = Table(io)
     table.set_headers(["ISBN", "Title", "Author", "Price"])