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Exception: 9key_error error

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Today, I've got an error message:

Exception: 9key_error
CKey::CKey(); EC:KEY_new_by_curve_name failed
bitcoin in ThreadBitcoinMiner()

Console:

terminate called after throwing an instance of 'key_error'
  what():  CKey::CKey() : EC_KEY_new_by_curve_name failed
Aborted


I hope that isn't a buffer overflow. Have anybody this error message too?

OS: linux
Does it happen every time you run it, or just happened once at some random time?

I've never seen that fail before.  It's a call to OpenSSL that I assumed would never fail, but I put an error check there just in case.  I can't imagine how it would fail.  Out of memory maybe.

The code is:

key.h:
    EC_KEY* pkey;

        pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
        if (pkey == NULL)
            throw key_error("CKey::CKey() : EC_KEY_new_by_curve_name failed");

NID_secp256k1 is a constant.