diff --git a/sim/team-validator.js b/sim/team-validator.js
index e1bdd10305..8f02a112cb 100644
--- a/sim/team-validator.js
+++ b/sim/team-validator.js
@@ -508,7 +508,7 @@ class Validator {
 				}
 			}
 
-			if (!lsetData.sourcesBefore && lsetData.sources.every(source => 'SVD'.includes(source.charAt(1)))) {
+			if (!lsetData.sourcesBefore && lsetData.sources.length && lsetData.sources.every(source => 'SVD'.includes(source.charAt(1)))) {
 				// Every source is restricted
 				let legal = false;
 				for (const source of lsetData.sources) {