diff --git a/src/client/stores/CalculationStore/Effects/reaction.ts b/src/client/stores/CalculationStore/Effects/reaction.ts
index f922847..47afeb3 100644
--- a/src/client/stores/CalculationStore/Effects/reaction.ts
+++ b/src/client/stores/CalculationStore/Effects/reaction.ts
@@ -1479,7 +1479,7 @@ const reactionEffects: IReactionEffect[] = [
       return [configuration, selectConfiguration];
     },
     effect: ([configurationId, selectConfigurationOptions]) => {
-      if (selectConfigurationOptions.length) {
+      if (selectConfigurationOptions && selectConfigurationOptions.length) {
         if (!configurationId) {
           calculationStore.setValidation('selectConfiguration', false);
           return;