diff --git a/server/src/workflow-management/selector.ts b/server/src/workflow-management/selector.ts
index 1a2400af..69c79f15 100644
--- a/server/src/workflow-management/selector.ts
+++ b/server/src/workflow-management/selector.ts
@@ -135,7 +135,11 @@ export const getSelectors = async (page: Page, coordinates: Coordinates) => {
        let rootDocument: Document | Element;
 
        function finder(input: Element, options?: Partial<Options>) {
-         
+         if (input.nodeType !== Node.ELEMENT_NODE) {
+           throw new Error(`Can't generate CSS selector for non-element node type.`);
+         }
+
+
          const defaults: Options = {
            root: document.body,
            idName: (name: string) => true,