diff --git a/recipes.py b/recipes.py
index 9984c07..b828b4d 100644
--- a/recipes.py
+++ b/recipes.py
@@ -108,7 +108,10 @@ class PriceDB:
         self.unit = None
         if "unit" in dct:
             assert_type(dct, "unit", str)
-            self.unit = units.get(dct["unit"])
+            try:
+                self.unit = units.get(dct["unit"])
+            except RuntimeError as e:
+                issues.append(str(e))
         return issues
 
 
@@ -120,7 +123,10 @@ class IngredientInstance:
         assert_type(dct, "name", str)
         self.name = dct["name"]
 
-        self.ingredient = ingredients.get(self.name)
+        try:
+            self.ingredient = ingredients.get(self.name)
+        except RuntimeError as e:
+            issues.append(str(e))
 
         self.amount = 1.0
         if "amount" in dct:
@@ -134,7 +140,10 @@ class IngredientInstance:
         self.unit = None
         if "unit" in dct:
             assert_type(dct, "unit", str)
-            self.unit = units.get(dct["unit"])
+            try:
+                self.unit = units.get(dct["unit"])
+            except RuntimeError as e:
+                issues.append(str(e))
 
         self.note = ""
         if "note" in dct: