what was the first 1.0.1 version of openssl that was not vulnerable to heartbleed?

The first OpenSSL 1.0.1 version that was not vulnerable to the Heartbleed bug was OpenSSL 1.0.1g. Versions 1.0.1 through 1.0.1f (inclusive) were vulnerable, and the fix was introduced in 1.0.1g, released on April 7, 2014