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We used the set_session_max_idle_seconds in our 5.1.4 application to cope with some long-running REST interfaces.
When upgrading to 18.1 and later we find that calling this causes an internal error:
apex_util.set_session_max_idle_seconds(p_seconds => 3600);
ORA-20987: APEX - Internal Error - Contact your application administrator.
Details about this incident are available via debug id "16834".
ORA-06512: at "APEX_190100.WWV_FLOW_ERROR", line 1064
ORA-06512: at "APEX_190100.WWV_FLOW_ERROR", line 1431
ORA-06512: at "APEX_190100.WWV_FLOW_SESSION", line 366
ORA-06512: at "APEX_190100.WWV_FLOW_SESSION", line 1665
ORA-06512: at "APEX_190100.HTMLDB_UTIL", line 2973
ORA-06512: at line 2