diff --git a/app/src/main/java/gui/widget/SudokuRenderer.java b/app/src/main/java/gui/widget/SudokuRenderer.java
index 4b38cf1..cf823e7 100644
--- a/app/src/main/java/gui/widget/SudokuRenderer.java
+++ b/app/src/main/java/gui/widget/SudokuRenderer.java
@@ -117,6 +117,7 @@ public class SudokuRenderer {
 					ImGui.sameLine();
 				int index = y * doku.getWidth() + x;
 				Cell cell = doku.getCell(x, y);
+				ImGui.beginDisabled(cell == null);
 				if (cell == null) {
 					ImGui.pushStyleColor(ImGuiCol.Border, TRANSPARENT);
 					ImGui.pushStyleColor(ImGuiCol.Button, TRANSPARENT);
@@ -141,6 +142,7 @@ public class SudokuRenderer {
 						currentCell = cell;
 					}
 				}
+				ImGui.endDisabled();
 				ImGui.popStyleColor(2);
 			}
 		}