In Service Portal, an empty value is displayed in List Collector catalog variables when a default value is set for the List Collector.Description<!-- div.margin { padding: 10px 40px 40px 30px; } table.tocTable { border: 1px solid; border-color: #e0e0e0; background-color: #fff; } .title { color: #d1232b; font-weight: normal; font-size: 28px; } h1 { color: #d1232b; font-weight: normal; font-size: 21px; margin-bottom: 5px; border-bottom-width: 2px; border-bottom-style: solid; border-bottom-color: #cccccc; } h2 { color: #646464; font-weight: bold; font-size: 18px; } h3 { color: #000000; font-weight: bold; font-size: 16px; } h4 { color: #666666; font-weight: bold; font-size: 15px; } h5 { color: #000000; font-weight: bold; font-size: 13px; } h6 { color: #000000; font-weight: bold; font-size:14px; } ul, ol { margin-left: 0; list-style-position: outside; } --> Symptoms In Service Portal, an empty value is displayed in List Collector catalog variables when a Default Value is set for the List Collector. Notice the Default Value is not displayed. The issue only happens when the page is displayed for first time or re-loaded. Step to reproduce: 1.Create a table, for example: u_option with the following string values: Mouse PrinterPhone Network 2. Go to any catalog item 3. Create a List Collector variable and provide: Question: select an option Name: select_an_option List table: u_optionDefault Value: printer The variable can be mandatory or not. 4. Go to Service Portal and display the catalog item *** Notice the Default value is not displayed in the List Collector 5. Go to the List Collector and select any value. For example Network. The mouse option is displayed and an extra empty value is displayed/selected. If the empty value is deleted and you select other list value, the issue does not happen. But if the page is re-loaded and select a value, then the issue happens again. Release All current supported releases. Cause This behavior is reported in PRB1334665 which is currently under investigation. Resolution Removing the Default Value in the List Collector will eliminate the extra empty value.