diff --git a/lib/www/server/lib/comparisons/geometric-differences.js b/lib/www/server/lib/comparisons/geometric-differences.js
index 79b5ff3..4da165c 100644
--- a/lib/www/server/lib/comparisons/geometric-differences.js
+++ b/lib/www/server/lib/comparisons/geometric-differences.js
@@ -330,44 +330,80 @@ async function saveGroup (group, opts = {}) {
 
 async function getGroup (groupName, opts = {}) {
 
-	const group = (await groups())?.[groupName]?.map( i => i.pid)?.sort();
-
-	if (!group?.length || group?.length < 2) return;
-
 	const client = await pool.connect();
 
 	try {
 
-		const pairs = combinations(group, 2);
-		const flatValues = pairs.flat();
-		const placeholders = [];
-		for (let i = 0; i < pairs.length; i++) {
-			placeholders.push(`($${i * 2 + 1}, $${i * 2 + 2})`);
-		}
-		const inClause = placeholders.join(',');
-		const selectFields = opts.returnData ? 'data, meta' : 'meta';
+		if (groupName) {
 
-		const text = `
-			SELECT baseline_pid, monitor_pid, ${selectFields}
-			FROM comparisons.comparisons
-			WHERE type = 'geometric_difference'
-			AND (baseline_pid, monitor_pid) IN (VALUES ${inClause})
-			ORDER BY baseline_pid, monitor_pid
-		`;
+			const group = (await groups())?.[groupName]?.map( i => i.pid)?.sort();
 
-		const res = await client.query(text, flatValues);
-		if (!res.rows.length) {
-			console.log("Comparison not found in database");
-			return;
-		}
+			if (!group?.length || group?.length < 2) return;
+
+
+			const pairs = combinations(group, 2);
+			const flatValues = pairs.flat();
+			const placeholders = [];
+			for (let i = 0; i < pairs.length; i++) {
+				placeholders.push(`($${i * 2 + 1}, $${i * 2 + 2})`);
+			}
+			const inClause = placeholders.join(',');
+			const selectFields = opts.returnData ? 'data, meta' : 'meta';
+
+			const text = `
+				SELECT baseline_pid, monitor_pid, ${selectFields}
+				FROM comparisons.comparisons
+				WHERE type = 'geometric_difference'
+				AND (baseline_pid, monitor_pid) IN (VALUES ${inClause})
+				ORDER BY baseline_pid, monitor_pid
+			`;
+
+			if (!placeholders) {
+				console.log("No pairs found in group");
+				return [];
+			}
+
+			const res = await client.query(text, flatValues);
+			if (!res.rows.length) {
+				console.log("Comparison not found in database");
+				return;
+			}
+
+			if (opts.returnData) {
+				return res.rows.map( row => ({
+					...row,
+					data: DougalBinaryBundle.clone(row.data),
+				}));
+			} else {
+				return res.rows;
+			}
 
-		if (opts.returnData) {
-			return res.rows.map( row => ({
-				...row,
-				data: DougalBinaryBundle.clone(row.data),
-			}));
 		} else {
-			return res.rows;
+
+			const selectFields = opts.returnData ? 'data, meta' : 'meta';
+
+			const text = `
+				SELECT baseline_pid, monitor_pid, ${selectFields}
+				FROM comparisons.comparisons
+				WHERE type = 'geometric_difference'
+				ORDER BY baseline_pid, monitor_pid
+			`;
+
+			const res = await client.query(text);
+			if (!res.rows.length) {
+				console.log("Comparison not found in database");
+				return;
+			}
+
+			if (opts.returnData) {
+				return res.rows.map( row => ({
+					...row,
+					data: DougalBinaryBundle.clone(row.data),
+				}));
+			} else {
+				return res.rows;
+			}
+
 		}
 	} catch (err) {
 		console.error(err);