-| | | ... | ${DUT1} | ${INT1_NAME} | ${SUB_ID}
-| | ${subif_name_2} | ${subif_index_2}= | Create Vlan Subinterface
-| | | ... | ${DUT2} | ${INT2_NAME} | ${SUB_ID}
+| | ... | ${DUT1} | ${INT1_NAME} | ${SUB_ID}
+| | ${subif_name_2} | ${subif_index_2}=
+| | ... | Run Keyword Unless | ${DUT2} == ${None}
+| | ... | Create Vlan Subinterface | ${DUT2} | ${INT2_NAME} | ${SUB_ID}