diff --git a/src/main/java/mezz/jei/gui/ingredients/GuiIngredient.java b/src/main/java/mezz/jei/gui/ingredients/GuiIngredient.java
index 1d304a818..92f94d906 100644
--- a/src/main/java/mezz/jei/gui/ingredients/GuiIngredient.java
+++ b/src/main/java/mezz/jei/gui/ingredients/GuiIngredient.java
@@ -107,7 +107,7 @@ public void set(T ingredient, IFocus<T> focus) {
 	public void set(List<T> ingredients, IFocus<T> focus) {
 		this.displayIngredients.clear();
 		this.allIngredients.clear();
-		ingredientHelper.expandSubtypes(ingredients);
+		ingredients = this.ingredientHelper.expandSubtypes(ingredients);
 
 		T match = getMatch(ingredients, focus);
 		if (match != null) {
diff --git a/src/main/java/mezz/jei/gui/ingredients/GuiIngredientGroup.java b/src/main/java/mezz/jei/gui/ingredients/GuiIngredientGroup.java
index b5e674f66..01d431e74 100644
--- a/src/main/java/mezz/jei/gui/ingredients/GuiIngredientGroup.java
+++ b/src/main/java/mezz/jei/gui/ingredients/GuiIngredientGroup.java
@@ -19,6 +19,7 @@
 import mezz.jei.api.recipe.IFocus;
 import mezz.jei.input.ClickedIngredient;
 import mezz.jei.input.IClickedIngredient;
+import mezz.jei.util.Log;
 import net.minecraft.client.Minecraft;
 
 public class GuiIngredientGroup<T> implements IGuiIngredientGroup<T> {
@@ -84,6 +85,13 @@ public void set(int slotIndex, Collection<T> values) {
 
 	@Override
 	public void set(int slotIndex, List<T> ingredients) {
+		// Sanitize API input
+		for (T ingredient : ingredients) {
+			if (!ingredientClass.isInstance(ingredient)) {
+				Log.error("Received wrong type of ingredient. Expected {}, got {}", ingredientClass, ingredient.getClass(), new IllegalArgumentException());
+				return;
+			}
+		}
 		guiIngredients.get(slotIndex).set(ingredients, focus);
 	}