diff --git a/frontend/components/dataflow/connection/redesigned/RightPanel/ControlConditionStep.tsx b/frontend/components/dataflow/connection/redesigned/RightPanel/ControlConditionStep.tsx
index 4d6dcc4a..d4995b48 100644
--- a/frontend/components/dataflow/connection/redesigned/RightPanel/ControlConditionStep.tsx
+++ b/frontend/components/dataflow/connection/redesigned/RightPanel/ControlConditionStep.tsx
@@ -233,6 +233,7 @@ const ControlConditionStep: React.FC<ControlConditionStepProps> = ({ state, acti
                             {[...fromColumns, ...toColumns]
                               .filter(
                                 (col, index, array) =>
+                                  col.columnName && // 빈 문자열 제외
                                   array.findIndex((c) => c.columnName === col.columnName) === index,
                               )
                               .map((col) => (