diff --git a/core/src/main/java/com/alibaba/fastjson2/JSONReader.java b/core/src/main/java/com/alibaba/fastjson2/JSONReader.java
index 3f3fac5f3b..05f260a5b0 100644
--- a/core/src/main/java/com/alibaba/fastjson2/JSONReader.java
+++ b/core/src/main/java/com/alibaba/fastjson2/JSONReader.java
@@ -1445,6 +1445,11 @@ public ZonedDateTime readZonedDateTime() {
 
             return ZonedDateTime.parse(str);
         }
+
+        if (isNull()) {
+            readNull();
+            return null;
+        }
         throw new JSONException("TODO : " + ch);
     }
 
diff --git a/core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF16.java b/core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF16.java
index 1494de982c..b93af658be 100644
--- a/core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF16.java
+++ b/core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF16.java
@@ -5789,7 +5789,8 @@ public final OffsetDateTime readOffsetDateTime() {
                     ) {
                         year = (y0 - '0') * 1000 + (y1 - '0') * 100 + (y2 - '0') * 10 + (y3 - '0');
                     } else {
-                        return readZonedDateTime().toOffsetDateTime();
+                        ZonedDateTime zdt = readZonedDateTime();
+                        return zdt == null ? null : zdt.toOffsetDateTime();
                     }
 
                     if (m0 >= '0' && m0 <= '9'
@@ -5797,7 +5798,8 @@ public final OffsetDateTime readOffsetDateTime() {
                     ) {
                         month = (m0 - '0') * 10 + (m1 - '0');
                     } else {
-                        return readZonedDateTime().toOffsetDateTime();
+                        ZonedDateTime zdt = readZonedDateTime();
+                        return zdt == null ? null : zdt.toOffsetDateTime();
                     }
 
                     int dom;
@@ -5806,7 +5808,8 @@ public final OffsetDateTime readOffsetDateTime() {
                     ) {
                         dom = (d0 - '0') * 10 + (d1 - '0');
                     } else {
-                        return readZonedDateTime().toOffsetDateTime();
+                        ZonedDateTime zdt = readZonedDateTime();
+                        return zdt == null ? null : zdt.toOffsetDateTime();
                     }
 
                     int hour;
@@ -5815,7 +5818,8 @@ public final OffsetDateTime readOffsetDateTime() {
                     ) {
                         hour = (h0 - '0') * 10 + (h1 - '0');
                     } else {
-                        return readZonedDateTime().toOffsetDateTime();
+                        ZonedDateTime zdt = readZonedDateTime();
+                        return zdt == null ? null : zdt.toOffsetDateTime();
                     }
 
                     int minute;
@@ -5824,7 +5828,8 @@ public final OffsetDateTime readOffsetDateTime() {
                     ) {
                         minute = (i0 - '0') * 10 + (i1 - '0');
                     } else {
-                        return readZonedDateTime().toOffsetDateTime();
+                        ZonedDateTime zdt = readZonedDateTime();
+                        return zdt == null ? null : zdt.toOffsetDateTime();
                     }
 
                     int second;
@@ -5833,7 +5838,8 @@ public final OffsetDateTime readOffsetDateTime() {
                     ) {
                         second = (s0 - '0') * 10 + (s1 - '0');
                     } else {
-                        return readZonedDateTime().toOffsetDateTime();
+                        ZonedDateTime zdt = readZonedDateTime();
+                        return zdt == null ? null : zdt.toOffsetDateTime();
                     }
 
                     LocalDate localDate;
@@ -5871,7 +5877,8 @@ public final OffsetDateTime readOffsetDateTime() {
                 }
             }
         }
-        return readZonedDateTime().toOffsetDateTime();
+        ZonedDateTime zdt = readZonedDateTime();
+        return zdt == null ? null : zdt.toOffsetDateTime();
     }
 
     @Override
diff --git a/core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF8.java b/core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF8.java
index dcced30bff..ba651553dd 100644
--- a/core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF8.java
+++ b/core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF8.java
@@ -7024,7 +7024,8 @@ public final OffsetDateTime readOffsetDateTime() {
                     ) {
                         year = (y0 - '0') * 1000 + (y1 - '0') * 100 + (y2 - '0') * 10 + (y3 - '0');
                     } else {
-                        return readZonedDateTime().toOffsetDateTime();
+                        ZonedDateTime zdt = readZonedDateTime();
+                        return zdt == null ? null : zdt.toOffsetDateTime();
                     }
 
                     if (m0 >= '0' && m0 <= '9'
@@ -7032,7 +7033,8 @@ public final OffsetDateTime readOffsetDateTime() {
                     ) {
                         month = (m0 - '0') * 10 + (m1 - '0');
                     } else {
-                        return readZonedDateTime().toOffsetDateTime();
+                        ZonedDateTime zdt = readZonedDateTime();
+                        return zdt == null ? null : zdt.toOffsetDateTime();
                     }
 
                     int dom;
@@ -7041,7 +7043,8 @@ public final OffsetDateTime readOffsetDateTime() {
                     ) {
                         dom = (d0 - '0') * 10 + (d1 - '0');
                     } else {
-                        return readZonedDateTime().toOffsetDateTime();
+                        ZonedDateTime zdt = readZonedDateTime();
+                        return zdt == null ? null : zdt.toOffsetDateTime();
                     }
 
                     int hour;
@@ -7050,7 +7053,8 @@ public final OffsetDateTime readOffsetDateTime() {
                     ) {
                         hour = (h0 - '0') * 10 + (h1 - '0');
                     } else {
-                        return readZonedDateTime().toOffsetDateTime();
+                        ZonedDateTime zdt = readZonedDateTime();
+                        return zdt == null ? null : zdt.toOffsetDateTime();
                     }
 
                     int minute;
@@ -7059,7 +7063,8 @@ public final OffsetDateTime readOffsetDateTime() {
                     ) {
                         minute = (i0 - '0') * 10 + (i1 - '0');
                     } else {
-                        return readZonedDateTime().toOffsetDateTime();
+                        ZonedDateTime zdt = readZonedDateTime();
+                        return zdt == null ? null : zdt.toOffsetDateTime();
                     }
 
                     int second;
@@ -7068,7 +7073,8 @@ public final OffsetDateTime readOffsetDateTime() {
                     ) {
                         second = (s0 - '0') * 10 + (s1 - '0');
                     } else {
-                        return readZonedDateTime().toOffsetDateTime();
+                        ZonedDateTime zdt = readZonedDateTime();
+                        return zdt == null ? null : zdt.toOffsetDateTime();
                     }
 
                     LocalDate localDate;
@@ -7106,7 +7112,8 @@ public final OffsetDateTime readOffsetDateTime() {
                 }
             }
         }
-        return readZonedDateTime().toOffsetDateTime();
+        ZonedDateTime zdt = readZonedDateTime();
+        return zdt == null ? null : zdt.toOffsetDateTime();
     }
 
     @Override
diff --git a/core/src/test/java/com/alibaba/fastjson2/issues_1800/Issue1861.java b/core/src/test/java/com/alibaba/fastjson2/issues_1800/Issue1861.java
new file mode 100644
index 0000000000..bd902a9b5a
--- /dev/null
+++ b/core/src/test/java/com/alibaba/fastjson2/issues_1800/Issue1861.java
@@ -0,0 +1,59 @@
+package com.alibaba.fastjson2.issues_1800;
+
+import com.alibaba.fastjson2.JSON;
+import com.alibaba.fastjson2.JSONWriter;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import org.junit.jupiter.api.Test;
+
+import javax.validation.Valid;
+import java.time.OffsetDateTime;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class Issue1861 {
+    @Test
+    public void test() {
+        String json = "{\"myData1\":{\"myData2\":{\"key\":{\"startTime\":null}}}}";
+        MyData data = JSON.parseObject(json, MyData.class);
+        assertEquals(json, JSON.toJSONString(data, JSONWriter.Feature.WriteNulls));
+    }
+
+    public class MyData {
+        private MyData1 myData1;
+
+        public MyData1 getMyData1() {
+            return myData1;
+        }
+
+        public void setMyData1(MyData1 myData1) {
+            this.myData1 = myData1;
+        }
+    }
+
+    public class MyData1 {
+        @JsonProperty("myData2")
+        private @Valid Map<String, MyData2> myData2 = null;
+
+        public Map<String, MyData2> getMyData2() {
+            return myData2;
+        }
+
+        public void setMyData2(Map<String, MyData2> myData2) {
+            this.myData2 = myData2;
+        }
+    }
+
+    public class MyData2 {
+        @JsonProperty("startTime")
+        private OffsetDateTime startTime;
+
+        public OffsetDateTime getStartTime() {
+            return startTime;
+        }
+
+        public void setStartTime(OffsetDateTime startTime) {
+            this.startTime = startTime;
+        }
+    }
+}