Incoming BER Element may be misformed

Seeing the below error in error log:

ERR - log_ber_too_big_error - conn=1481 fd=68 Incoming BER Element may be misformed. This may indicate an attempt to use TLS on a plaintext port, IE ldaps://localhost:389. Check your client LDAP_URI settings.

Can you please advise what could this error leads to ?