diff --git a/django/core/cache/backends/locmem.py b/django/core/cache/backends/locmem.py
index cab690b..73b02a5 100644
--- a/django/core/cache/backends/locmem.py
+++ b/django/core/cache/backends/locmem.py
@@ -27,10 +27,7 @@ class LocMemCache(BaseCache):
     def add(self, key, value, timeout=DEFAULT_TIMEOUT, version=None):
         key = self.make_key(key, version=version)
         self.validate_key(key)
-        try:
-            pickled = pickle.dumps(value, pickle.HIGHEST_PROTOCOL)
-        except pickle.PickleError:
-            return False
+        pickled = pickle.dumps(value, pickle.HIGHEST_PROTOCOL)
         with self._lock.writer():
             exp = self._expire_info.get(key)
             if exp is None or exp <= time.time():
@@ -69,13 +66,9 @@ class LocMemCache(BaseCache):
     def set(self, key, value, timeout=DEFAULT_TIMEOUT, version=None):
         key = self.make_key(key, version=version)
         self.validate_key(key)
-        try:
-            pickled = pickle.dumps(value, pickle.HIGHEST_PROTOCOL)
-        except pickle.PickleError:
-            pass
-        else:
-            with self._lock.writer():
-                self._set(key, pickled, timeout)
+        pickled = pickle.dumps(value, pickle.HIGHEST_PROTOCOL)
+        with self._lock.writer():
+            self._set(key, pickled, timeout)
 
     def incr(self, key, delta=1, version=None):
         value = self.get(key, version=version)
@@ -83,13 +76,9 @@ class LocMemCache(BaseCache):
             raise ValueError("Key '%s' not found" % key)
         new_value = value + delta
         key = self.make_key(key, version=version)
-        try:
-            pickled = pickle.dumps(new_value, pickle.HIGHEST_PROTOCOL)
-        except pickle.PickleError:
-            pass
-        else:
-            with self._lock.writer():
-                self._cache[key] = pickled
+        pickled = pickle.dumps(new_value, pickle.HIGHEST_PROTOCOL)
+        with self._lock.writer():
+            self._cache[key] = pickled
         return new_value
 
     def has_key(self, key, version=None):