<function>sd_bus_message_get_interface()</function>, and
<function>sd_bus_message_get_member()</function> return the destination, path, interface, and
member fields from <parameter>message</parameter> header. The return value will be
- <constant>NULL</constant> is <parameter>message</parameter> is <constant>NULL</constant> or the
+ <constant>NULL</constant> if <parameter>message</parameter> is <constant>NULL</constant> or the
message is of a type that does not use those fields or the message does not have them set. See
<citerefentry><refentrytitle>sd_bus_message_new_method_call</refentrytitle><manvolnum>3</manvolnum></citerefentry> and
<citerefentry><refentrytitle>sd_bus_message_set_destination</refentrytitle><manvolnum>3</manvolnum></citerefentry>