diff --git a/app/src/main/java/sudoku/constraint/ColumnConstraint.java b/app/src/main/java/sudoku/constraint/ColumnConstraint.java
index 881faab..7045b00 100644
--- a/app/src/main/java/sudoku/constraint/ColumnConstraint.java
+++ b/app/src/main/java/sudoku/constraint/ColumnConstraint.java
@@ -7,7 +7,7 @@ public class ColumnConstraint implements IConstraint {
 	@Override
 	public boolean canBePlaced(final Sudoku s, int x, int y, int newSymbolIndex) {
 		for (int i = 0; i < s.getSize(); i++) {
-			if (s.getCell(x, newSymbolIndex).getSymbolIndex() == newSymbolIndex)
+			if (s.getCell(x, i).getSymbolIndex() == newSymbolIndex)
 				return false;
 		}
 		return true;
diff --git a/app/src/main/java/sudoku/constraint/LineConstraint.java b/app/src/main/java/sudoku/constraint/LineConstraint.java
index 2f9a81e..b568928 100644
--- a/app/src/main/java/sudoku/constraint/LineConstraint.java
+++ b/app/src/main/java/sudoku/constraint/LineConstraint.java
@@ -7,7 +7,7 @@ public class LineConstraint implements IConstraint {
 	@Override
 	public boolean canBePlaced(final Sudoku s, int x, int y, int newSymbolIndex) {
 		for (int i = 0; i < s.getSize(); i++) {
-			if (s.getCell(newSymbolIndex, y).getSymbolIndex() == newSymbolIndex)
+			if (s.getCell(i, y).getSymbolIndex() == newSymbolIndex)
 				return false;
 		}
 		return true;