Git complaining about known_hosts

Today I was faced with the following error message in Git:

After asking Google without success I started searching for the key, listed in the message, on my file system. It seems my known_hosts file, locaed in the ~/.ssh/ folder, had an error in one of the listed lines: there were two entries (with the key listed above) in a single row. After deleting the line, the error message disapeared.

Problem fixed!