diff --git a/lib/matplotlib/rcsetup.py b/lib/matplotlib/rcsetup.py
index 5a5914ba7b3b..9061a1373703 100644
--- a/lib/matplotlib/rcsetup.py
+++ b/lib/matplotlib/rcsetup.py
@@ -68,7 +68,7 @@ def __call__(self, s):
name, = (k for k, v in globals().items() if v is self)
_api.warn_deprecated(
self._deprecated_since, name=name, obj_type="function")
- if self.ignorecase:
+ if self.ignorecase and isinstance(s, str):
s = s.lower()
if s in self.valid:
return self.valid[s]
diff --git a/lib/matplotlib/tests/test_rcparams.py b/lib/matplotlib/tests/test_rcparams.py
index d5f316f54595..7120f6c021de 100644
--- a/lib/matplotlib/tests/test_rcparams.py
+++ b/lib/matplotlib/tests/test_rcparams.py
@@ -1,6 +1,7 @@
import copy
import os
from pathlib import Path
+import re
import subprocess
import sys
from unittest import mock
@@ -591,3 +592,10 @@ def test_deprecation(monkeypatch):
# Note that the warning suppression actually arises from the
# iteration over the updater rcParams being protected by
# suppress_matplotlib_deprecation_warning, rather than any explicit check.
+
+
+def test_rcparams_legend_loc():
+ value = (0.9, .7)
+ match_str = f"{value} is not a valid value for legend.loc;"
+ with pytest.raises(ValueError, match=re.escape(match_str)):
+ mpl.RcParams({'legend.loc': value})
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