diff --git a/django/core/cache/backends/locmem.py b/django/core/cache/backends/locmem.py
index b34ce0595c..91e2f2f8da 100644
--- a/django/core/cache/backends/locmem.py
+++ b/django/core/cache/backends/locmem.py
@@ -58,8 +58,11 @@ class CacheClass(BaseCache):
             self._lock.reader_leaves()
         self._lock.writer_enters()
         try:
-            del self._cache[key]
-            del self._expire_info[key]
+            try:
+                del self._cache[key]
+                del self._expire_info[key]
+            except KeyError:
+                pass
             return default
         finally:
             self._lock.writer_leaves()