diff --git a/release-notes/CREDITS-2.x b/release-notes/CREDITS-2.x
index b5a89511b1..8ee09a01ce 100644
--- a/release-notes/CREDITS-2.x
+++ b/release-notes/CREDITS-2.x
@@ -843,6 +843,10 @@ Cyril Martin (mcoolive@github.com)
     does not provide "Type(Type(null))"
    (2.9.9)
 
-Daniil Barvitsky (dbarvitsky@github(
+Daniil Barvitsky (dbarvitsky@github)
   * Reported #2324: `StringCollectionDeserializer` fails with custom collection
    (2.9.9)
+
+Edgar Asatryan (nstdio@github)
+  * Reported #2374: `ObjectMapper. getRegisteredModuleIds()` throws NPE if no modules registered
+   (2.9.9.1)
diff --git a/release-notes/VERSION-2.x b/release-notes/VERSION-2.x
index fc309ce37c..742e6121cd 100644
--- a/release-notes/VERSION-2.x
+++ b/release-notes/VERSION-2.x
@@ -8,6 +8,8 @@ Project: jackson-databind
 
 #2326: Block one more gadget type (CVE-2019-12384)
 #2341: Block one more gadget type (CVE-2019-12814)
+#2374: `ObjectMapper. getRegisteredModuleIds()` throws NPE if no modules registered
+ (reported by Edgar A)
 
 2.9.9 (16-May-2019)
 
diff --git a/src/main/java/com/fasterxml/jackson/databind/ObjectMapper.java b/src/main/java/com/fasterxml/jackson/databind/ObjectMapper.java
index adfb09b496..f4e571def0 100644
--- a/src/main/java/com/fasterxml/jackson/databind/ObjectMapper.java
+++ b/src/main/java/com/fasterxml/jackson/databind/ObjectMapper.java
@@ -962,7 +962,8 @@ public ObjectMapper registerModules(Iterable<? extends Module> modules)
      */
     public Set<Object> getRegisteredModuleIds()
     {
-        return Collections.unmodifiableSet(_registeredModuleTypes);
+        return (_registeredModuleTypes == null) ?
+                Collections.emptySet() : Collections.unmodifiableSet(_registeredModuleTypes);
     }
 
     /**
diff --git a/src/test/java/com/fasterxml/jackson/databind/module/SimpleModuleTest.java b/src/test/java/com/fasterxml/jackson/databind/module/SimpleModuleTest.java
index 40a189e69d..da9e7dc7e4 100644
--- a/src/test/java/com/fasterxml/jackson/databind/module/SimpleModuleTest.java
+++ b/src/test/java/com/fasterxml/jackson/databind/module/SimpleModuleTest.java
@@ -319,6 +319,7 @@ public void testGetRegisteredModules()
         AnotherSimpleModule mod2 = new AnotherSimpleModule("test2", Version.unknownVersion());
 
         ObjectMapper mapper = new ObjectMapper();
+
         mapper.registerModule(mod1);
         mapper.registerModule(mod2);
 
@@ -326,6 +327,10 @@ public void testGetRegisteredModules()
         assertEquals(2, registeredModuleIds.size());
         assertTrue(registeredModuleIds.contains(mod1.getTypeId()));
         assertTrue(registeredModuleIds.contains(mod2.getTypeId()));
+
+        // 01-Jul-2019, [databind#2374]: verify empty list is fine
+        mapper = new ObjectMapper();
+        assertEquals(0, mapper.getRegisteredModuleIds().size());
     }
 
     /*