diff --git a/src/kernel/operation/BinaryOperation.java b/src/kernel/operation/BinaryOperation.java
index 6181112..c7cd7c4 100644
--- a/src/kernel/operation/BinaryOperation.java
+++ b/src/kernel/operation/BinaryOperation.java
@@ -42,16 +42,10 @@ abstract public class BinaryOperation implements Formula, Serializable {
 	
 	@Override
 	public boolean createCycle(Cell cell) {
-		if (this.leftCell.containFormula() && !this.rightCell.containFormula())
-			return this.leftCell.getFormula().createCycle(cell);
+		if (this.createCycleWith(this.leftCell, cell) || this.createCycleWith(this.rightCell, cell))
+			return true;
 		
-		if (!this.leftCell.containFormula() && this.rightCell.containFormula())
-			return this.rightCell.getFormula().createCycle(cell);
-		
-		if (this.leftCell.containFormula() && this.rightCell.containFormula())
-			return this.leftCell.getFormula().createCycle(cell) && this.rightCell.getFormula().createCycle(cell);
-		
-		return (cell.getId().equals(this.rightCell.getId()) || cell.getId().equals(this.leftCell.getId()));
+		return this.rightCell.equals(cell) || this.leftCell.equals(cell);
 	}
 	
 	@Override
@@ -62,4 +56,8 @@ abstract public class BinaryOperation implements Formula, Serializable {
 		
 		return cells;
 	}
+	
+	private boolean createCycleWith(Cell cell, Cell current) {
+		return cell.containFormula() && cell.getFormula().createCycle(current);
+	}
 }
--
libgit2 0.21.2