diff --git a/sentry/api/sentry.api b/sentry/api/sentry.api
index c78e9f73da..02c49a4ef0 100644
--- a/sentry/api/sentry.api
+++ b/sentry/api/sentry.api
@@ -1451,6 +1451,7 @@ public abstract interface class io/sentry/ObjectReader : java/io/Closeable {
 	public abstract fun nextListOrNull (Lio/sentry/ILogger;Lio/sentry/JsonDeserializer;)Ljava/util/List;
 	public abstract fun nextLong ()J
 	public abstract fun nextLongOrNull ()Ljava/lang/Long;
+	public abstract fun nextMapOfListOrNull (Lio/sentry/ILogger;Lio/sentry/JsonDeserializer;)Ljava/util/Map;
 	public abstract fun nextMapOrNull (Lio/sentry/ILogger;Lio/sentry/JsonDeserializer;)Ljava/util/Map;
 	public abstract fun nextName ()Ljava/lang/String;
 	public abstract fun nextNull ()V
@@ -4346,8 +4347,8 @@ public final class io/sentry/protocol/MetricSummary : io/sentry/JsonSerializable
 
 public final class io/sentry/protocol/MetricSummary$Deserializer : io/sentry/JsonDeserializer {
 	public fun <init> ()V
-	public fun deserialize (Lio/sentry/JsonObjectReader;Lio/sentry/ILogger;)Lio/sentry/protocol/MetricSummary;
-	public synthetic fun deserialize (Lio/sentry/JsonObjectReader;Lio/sentry/ILogger;)Ljava/lang/Object;
+	public fun deserialize (Lio/sentry/ObjectReader;Lio/sentry/ILogger;)Lio/sentry/protocol/MetricSummary;
+	public synthetic fun deserialize (Lio/sentry/ObjectReader;Lio/sentry/ILogger;)Ljava/lang/Object;
 }
 
 public final class io/sentry/protocol/MetricSummary$JsonKeys {
@@ -5406,6 +5407,7 @@ public final class io/sentry/util/MapObjectReader : io/sentry/ObjectReader {
 	public fun nextListOrNull (Lio/sentry/ILogger;Lio/sentry/JsonDeserializer;)Ljava/util/List;
 	public fun nextLong ()J
 	public fun nextLongOrNull ()Ljava/lang/Long;
+	public fun nextMapOfListOrNull (Lio/sentry/ILogger;Lio/sentry/JsonDeserializer;)Ljava/util/Map;
 	public fun nextMapOrNull (Lio/sentry/ILogger;Lio/sentry/JsonDeserializer;)Ljava/util/Map;
 	public fun nextName ()Ljava/lang/String;
 	public fun nextNull ()V
diff --git a/sentry/src/main/java/io/sentry/JsonObjectReader.java b/sentry/src/main/java/io/sentry/JsonObjectReader.java
index c348b533e2..f9fe184184 100644
--- a/sentry/src/main/java/io/sentry/JsonObjectReader.java
+++ b/sentry/src/main/java/io/sentry/JsonObjectReader.java
@@ -137,6 +137,7 @@ public void nextUnknown(ILogger logger, Map<String, Object> unknown, String name
     return map;
   }
 
+  @Override
   public <T> @Nullable Map<String, List<T>> nextMapOfListOrNull(
       @NotNull ILogger logger, @NotNull JsonDeserializer<T> deserializer) throws IOException {
 
diff --git a/sentry/src/main/java/io/sentry/ObjectReader.java b/sentry/src/main/java/io/sentry/ObjectReader.java
index 6c2210897e..6ea43926b0 100644
--- a/sentry/src/main/java/io/sentry/ObjectReader.java
+++ b/sentry/src/main/java/io/sentry/ObjectReader.java
@@ -36,6 +36,9 @@ public interface ObjectReader extends Closeable {
   <T> @Nullable Map<String, T> nextMapOrNull(
       @NotNull ILogger logger, @NotNull JsonDeserializer<T> deserializer) throws IOException;
 
+  <T> @Nullable Map<String, List<T>> nextMapOfListOrNull(
+      @NotNull ILogger logger, @NotNull JsonDeserializer<T> deserializer) throws IOException;
+
   <T> @Nullable T nextOrNull(@NotNull ILogger logger, @NotNull JsonDeserializer<T> deserializer)
       throws Exception;
 
diff --git a/sentry/src/main/java/io/sentry/protocol/Geo.java b/sentry/src/main/java/io/sentry/protocol/Geo.java
index 6042b72d1d..c9094223ab 100644
--- a/sentry/src/main/java/io/sentry/protocol/Geo.java
+++ b/sentry/src/main/java/io/sentry/protocol/Geo.java
@@ -161,7 +161,8 @@ public void serialize(final @NotNull ObjectWriter writer, final @NotNull ILogger
   public static final class Deserializer implements JsonDeserializer<Geo> {
 
     @Override
-    public Geo deserialize(@NotNull ObjectReader reader, ILogger logger) throws Exception {
+    public @NotNull Geo deserialize(@NotNull ObjectReader reader, @NotNull ILogger logger)
+        throws Exception {
       reader.beginObject();
       final Geo geo = new Geo();
       Map<String, Object> unknown = null;
diff --git a/sentry/src/main/java/io/sentry/protocol/MetricSummary.java b/sentry/src/main/java/io/sentry/protocol/MetricSummary.java
index db4f0b6ba5..f4a8b6de53 100644
--- a/sentry/src/main/java/io/sentry/protocol/MetricSummary.java
+++ b/sentry/src/main/java/io/sentry/protocol/MetricSummary.java
@@ -2,9 +2,9 @@
 
 import io.sentry.ILogger;
 import io.sentry.JsonDeserializer;
-import io.sentry.JsonObjectReader;
 import io.sentry.JsonSerializable;
 import io.sentry.JsonUnknown;
+import io.sentry.ObjectReader;
 import io.sentry.ObjectWriter;
 import io.sentry.util.CollectionUtils;
 import io.sentry.vendor.gson.stream.JsonToken;
@@ -121,7 +121,7 @@ public static final class Deserializer implements JsonDeserializer<MetricSummary
 
     @Override
     public @NotNull MetricSummary deserialize(
-        final @NotNull JsonObjectReader reader, final @NotNull ILogger logger) throws Exception {
+        final @NotNull ObjectReader reader, final @NotNull ILogger logger) throws Exception {
 
       final @NotNull MetricSummary summary = new MetricSummary();
       @Nullable Map<String, Object> unknown = null;
diff --git a/sentry/src/main/java/io/sentry/util/MapObjectReader.java b/sentry/src/main/java/io/sentry/util/MapObjectReader.java
index 6cb05989b2..cd44ee0777 100644
--- a/sentry/src/main/java/io/sentry/util/MapObjectReader.java
+++ b/sentry/src/main/java/io/sentry/util/MapObjectReader.java
@@ -53,6 +53,12 @@ public <T> Map<String, T> nextMapOrNull(
     return nextValueOrNull();
   }
 
+  @Override
+  public @Nullable <T> Map<String, List<T>> nextMapOfListOrNull(
+      @NotNull ILogger logger, @NotNull JsonDeserializer<T> deserializer) throws IOException {
+    return nextValueOrNull();
+  }
+
   @Nullable
   @Override
   public <T> T nextOrNull(
diff --git a/sentry/src/test/java/io/sentry/util/MapObjectReaderTest.kt b/sentry/src/test/java/io/sentry/util/MapObjectReaderTest.kt
index ab52919c43..06124c88e7 100644
--- a/sentry/src/test/java/io/sentry/util/MapObjectReaderTest.kt
+++ b/sentry/src/test/java/io/sentry/util/MapObjectReaderTest.kt
@@ -68,6 +68,7 @@ class MapObjectReaderTest {
         writer.name("Collection").value(logger, listOf("a", "b"))
         writer.name("Arrays").value(logger, arrayOf("b", "c"))
         writer.name("Map").value(logger, mapOf(kotlin.Pair("key", "value")))
+        writer.name("MapOfLists").value(logger, mapOf("metric_a" to listOf("foo")))
         writer.name("Locale").value(logger, Locale.US)
         writer.name("URI").value(logger, URI.create("http://www.example.com"))
         writer.name("UUID").value(logger, UUID.fromString("00000000-1111-2222-3333-444444444444"))
@@ -90,6 +91,13 @@ class MapObjectReaderTest {
         assertEquals(URI.create("http://www.example.com"), URI.create(reader.nextString()))
         assertEquals("Locale", reader.nextName())
         assertEquals(Locale.US.toString(), reader.nextString())
+        assertEquals("MapOfLists", reader.nextName())
+        reader.beginObject()
+        assertEquals("metric_a", reader.nextName())
+        reader.beginArray()
+        assertEquals("foo", reader.nextStringOrNull())
+        reader.endArray()
+        reader.endObject()
         assertEquals("Map", reader.nextName())
         // nested object
         reader.beginObject()