fix: null pointer issue for user that belongs to no tenant (#135)

CHANGELOG.md

@@ -7,6 +7,11 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+## [4.0.2]
+
+- Fixes null pointer issue when user belongs to no tenant.
+
+
 ## [4.0.1] - 2023-07-11
 
 - Fixes duplicate users in users search queries when user is associated to multiple tenants

build.gradle

@@ -2,7 +2,7 @@ plugins {
     id 'java-library'
 }
 
-version = "4.0.1"
+version = "4.0.2"
 
 repositories {
     mavenCentral()

src/main/java/io/supertokens/storage/postgresql/queries/GeneralQueries.java

@@ -1060,13 +1060,14 @@ public static Map<String, List<String>> getTenantIdsForUserIds_transaction(Start
                 }
             }, result -> {
                 Map<String, List<String>> finalResult = new HashMap<>();
+                for (String userId : userIds) {
+                    finalResult.put(userId, new ArrayList<>());
+                }
+
                 while (result.next()) {
                     String userId = result.getString("user_id").trim();
                     String tenantId = result.getString("tenant_id");
 
-                    if (!finalResult.containsKey(userId)) {
-                        finalResult.put(userId, new ArrayList<>());
-                    }
                     finalResult.get(userId).add(tenantId);
                 }
                 return finalResult;