fix nullptr

Author: ajungg

CHANGELOG.md

@@ -1,6 +1,11 @@
 # Changelog  
 All notable changes to this project will be documented in this file.
 
+## [0.42.2]
+
+### Fixed
+- Fixed NullPointerException introduced in 0.42.1
+
 ## [0.42.1]
 
 ### Fixed

build.gradle

@@ -31,7 +31,7 @@ allprojects {
     }
 
     project.ext {
-        sdkVersion='0.42.1'
+        sdkVersion='0.42.2'
         versionCode=1
 
         compileSdkVersion=30

core/src/main/java/io/snabble/sdk/Project.java

@@ -483,7 +483,10 @@ public String getText(String key, String defaultValue) {
      * payment process.
      */
     public void setCheckedInShop(Shop checkedInShop) {
-        if (this.checkedInShop == null || !this.checkedInShop.getId().equals(checkedInShop.getId())) {
+        String currentShopId = this.checkedInShop != null ? this.checkedInShop.getId() : "";
+        String newShopId = checkedInShop != null ? checkedInShop.getId() : "";
+
+        if (!currentShopId.equals(newShopId)) {
             this.checkedInShop = checkedInShop;
             events.updateShop(checkedInShop);
             getShoppingCart().updatePrices(false);