diff --git a/app/src/main/java/net/foucry/pilldroid/models/Medicine.java b/app/src/main/java/net/foucry/pilldroid/models/Medicine.java
index 7f7240e..1fd10be 100644
--- a/app/src/main/java/net/foucry/pilldroid/models/Medicine.java
+++ b/app/src/main/java/net/foucry/pilldroid/models/Medicine.java
@@ -7,7 +7,7 @@ import androidx.room.PrimaryKey;
 @Entity(tableName = "drugs")
 public class Medicine {
     @PrimaryKey
-    private Integer _id;
+    @NonNull private Integer _id;
     private String  cis;
     private String  cip13;
     private String  cip7;
diff --git a/app/src/main/java/net/foucry/pilldroid/models/Prescription.java b/app/src/main/java/net/foucry/pilldroid/models/Prescription.java
index 11c9170..709bad1 100644
--- a/app/src/main/java/net/foucry/pilldroid/models/Prescription.java
+++ b/app/src/main/java/net/foucry/pilldroid/models/Prescription.java
@@ -13,7 +13,7 @@ import java.util.Date;
 @Entity(tableName = "prescriptions")
 public class Prescription implements Serializable {
   @PrimaryKey
-  private String  cis;
+  @NonNull private String  cis;
   private String  cip13;
   private String  name;
   private String  administration_mode;