Duplicate Key Error in Cache

I ran into this problem using django core's database cache:

ERROR: duplicate key value violates unique constraint "cache_pkey"
STATEMENT: INSERT INTO "cache" (cache_key, value, expires) VALUES (E':
1:cms-menu_nodes_en-us_1', E'gAJdcQEoY21lbnVzLmJhc2UKTmF2aW
LOG: server process (PID 8453) was terminated by signal 9: Killed
LOG: terminating any other active server processes
LOG: all server processes terminated; reinitializing
FATAL: could not create shared memory segment: Cannot allocate memory
DETAIL: Failed system call was shmget(key=5432001, size=29278208,
03600).

I looked in the table and sure enough, there is an entry for the key ':
1:cms-menu_nodes_en-us_1'. I found a similar issue here (http://
stackoverflow.com/questions/1189541/django-cache-set-causing-duplicate-
key-error), but was unable to exactly understand what the issue is.

Sounds like a bug in django core, since if a key exist, it should
update the record. It looks as if somebody posted a ticket here
(https://code.djangoproject.com/ticket/11569), but not entireloy sure
if it is related. This problem sort of renders the database backend
useless. I would fix it if I knew how and contribute back, but really
don't know how.

Anyone have any ideas or suggestions?

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