diff --git a/catroid/src/main/java/org/catrobat/catroid/formulaeditor/FormulaEditorEditText.java b/catroid/src/main/java/org/catrobat/catroid/formulaeditor/FormulaEditorEditText.java
index 199f6b333d5..95456731c43 100644
--- a/catroid/src/main/java/org/catrobat/catroid/formulaeditor/FormulaEditorEditText.java
+++ b/catroid/src/main/java/org/catrobat/catroid/formulaeditor/FormulaEditorEditText.java
@@ -426,6 +426,9 @@ public FormulaEditorHistory getHistory() {
 	}
 
 	public boolean isThereSomethingToDelete() {
+		if (internFormula == null) {
+			return false;
+		}
 		return internFormula.isThereSomethingToDelete();
 	}
 
diff --git a/catroid/src/main/java/org/catrobat/catroid/ui/fragment/FormulaEditorFragment.java b/catroid/src/main/java/org/catrobat/catroid/ui/fragment/FormulaEditorFragment.java
index d0d4c5f1482..0f5d4a72ee3 100644
--- a/catroid/src/main/java/org/catrobat/catroid/ui/fragment/FormulaEditorFragment.java
+++ b/catroid/src/main/java/org/catrobat/catroid/ui/fragment/FormulaEditorFragment.java
@@ -732,6 +732,7 @@ public void onPrepareOptionsMenu(Menu menu) {
 		menu.findItem(R.id.menu_redo).setVisible(true);
 
 		super.onPrepareOptionsMenu(menu);
+		updateButtonsOnKeyboard();
 	}
 
 	@Override
@@ -1076,7 +1077,10 @@ public void onHiddenChanged(boolean hidden) {
 
 	public void updateButtonsOnKeyboardAndInvalidateOptionsMenu() {
 		getActivity().invalidateOptionsMenu();
+		updateButtonsOnKeyboard();
+	}
 
+	public void updateButtonsOnKeyboard() {
 		ImageButton backspaceOnKeyboard = getActivity().findViewById(R.id.formula_editor_keyboard_delete);
 		if (!formulaEditorEditText.isThereSomethingToDelete()) {
 			backspaceOnKeyboard.setAlpha(255 / 3);