diff --git a/src/models/actions/create/CreateGroupContact.ts b/src/models/actions/create/CreateGroupContact.ts
index c6538e8..e261f51 100644
--- a/src/models/actions/create/CreateGroupContact.ts
+++ b/src/models/actions/create/CreateGroupContact.ts
@@ -29,7 +29,7 @@ export class CreateGroupContact {
     lastname: string;
 
     /**
-     * The new contact's address.
+     * The new participant's address.
      */
     @IsOptional()
     @IsObject()
@@ -55,14 +55,14 @@ export class CreateGroupContact {
      * Creates a new Address entity from this.
      */
     public async toEntity(): Promise<GroupContact> {
-        let contact: GroupContact = new GroupContact();
-        contact.firstname = this.firstname;
-        contact.middlename = this.middlename;
-        contact.lastname = this.lastname;
-        contact.email = this.email;
-        contact.phone = this.phone;
-        contact.address = this.address;
-        Address.validate(contact.address);
-        return contact;
+        let newContact: GroupContact = new GroupContact();
+        newContact.firstname = this.firstname;
+        newContact.middlename = this.middlename;
+        newContact.lastname = this.lastname;
+        newContact.email = this.email;
+        newContact.phone = this.phone;
+        newContact.address = this.address;
+        Address.validate(newContact.address);
+        return newContact;
     }
 }
\ No newline at end of file
diff --git a/src/models/entities/Address.ts b/src/models/entities/Address.ts
index 21ec92a..6526c08 100644
--- a/src/models/entities/Address.ts
+++ b/src/models/entities/Address.ts
@@ -1,6 +1,4 @@
 import {
-  IsNotEmpty,
-  IsOptional,
   IsPostalCode,
   IsString
 } from "class-validator";
@@ -18,10 +16,9 @@ export class Address {
    * The address's first line.
    * Containing the street and house number.
    */
-  @Column()
+  @Column({ nullable: true })
   @IsString()
-  @IsNotEmpty()
-  address1: string;
+  address1?: string;
 
   /**
    * The address's second line.
@@ -29,33 +26,29 @@ export class Address {
    */
   @Column({ nullable: true })
   @IsString()
-  @IsOptional()
   address2?: string;
 
   /**
    * The address's postal code.
    * This will get checked against the postal code syntax for the configured country.
    */
-  @Column()
+  @Column({ nullable: true })
   @IsString()
-  @IsNotEmpty()
   @IsPostalCode(config.postalcode_validation_countrycode)
   postalcode: string;
 
   /**
    * The address's city.
    */
-  @Column()
+  @Column({ nullable: true })
   @IsString()
-  @IsNotEmpty()
   city: string;
 
   /**
    * The address's country.
    */
-  @Column()
+  @Column({ nullable: true })
   @IsString()
-  @IsNotEmpty()
   country: string;
 
   public reset() {
diff --git a/src/models/entities/GroupContact.ts b/src/models/entities/GroupContact.ts
index 17b0b9b..dd6eed1 100644
--- a/src/models/entities/GroupContact.ts
+++ b/src/models/entities/GroupContact.ts
@@ -54,7 +54,6 @@ export class GroupContact {
    * The contact's address.
    * This is a address object to prevent any formatting differences.
    */
-  @IsOptional()
   @Column(type => Address)
   address?: Address;