diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
@@ -4740,6 +4740,13 @@ def test_suggestions_extension(self):
             None
         )
 
+        self.assertRaises(
+            TypeError,
+            _suggestions._generate_suggestions,
+                ["hello", "world", 0, 1.1],
+                "hell",
+        )
+
         # gh-131936: _generate_suggestions() doesn't accept list subclasses
         class MyList(list):
             pass

diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-06-02-12-36-52.gh-issue-129573.zY2VO9.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-06-02-12-36-52.gh-issue-129573.zY2VO9.rst
@@ -0,0 +1 @@
+Avoid possible abort when getting suggestions and there are non-string candidates.
diff --git a/Python/suggestions.c b/Python/suggestions.c
@@ -149,6 +149,10 @@ _Py_CalculateSuggestions(PyObject *dir,
     }
     for (Py_ssize_t i = 0; i < dir_size; ++i) {
         PyObject *item = PyList_GET_ITEM(dir, i);
+        if (!PyUnicode_Check(item)) {
+            PyMem_Free(buffer);
+            return NULL;
+        }
         if (_PyUnicode_Equal(name, item)) {
             continue;
         }
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Avoid possible abort when getting suggestions and there are non-string candidates.