diff --git a/src/main/java/org/redkale/convert/json/JsonByteBufferReader.java b/src/main/java/org/redkale/convert/json/JsonByteBufferReader.java
index 683edc5e9..7fe884b61 100644
--- a/src/main/java/org/redkale/convert/json/JsonByteBufferReader.java
+++ b/src/main/java/org/redkale/convert/json/JsonByteBufferReader.java
@@ -132,6 +132,7 @@ public class JsonByteBufferReader extends JsonReader {
         if (ch == 'N' && nextChar() == 'U' && nextChar() == 'L' && nextChar() == 'L') {
             return null;
         }
+        int pos = this.position;
         StringBuilder sb = new StringBuilder();
         sb.append(ch);
         char one;
@@ -139,7 +140,7 @@ public class JsonByteBufferReader extends JsonReader {
             while ((one = nextChar()) != 0) sb.append(one);
         } catch (Exception e) {
         }
-        throw new ConvertException("a json object text must begin with '{' (position = " + position + ") but '" + ch + "' in (" + sb + ")");
+        throw new ConvertException("a json object text must begin with '{' (position = " + pos + ") but '" + ch + "' in (" + sb + ")");
     }
 
     /**
diff --git a/src/main/java/org/redkale/convert/json/JsonReader.java b/src/main/java/org/redkale/convert/json/JsonReader.java
index ad5a252c4..4168d7a0a 100644
--- a/src/main/java/org/redkale/convert/json/JsonReader.java
+++ b/src/main/java/org/redkale/convert/json/JsonReader.java
@@ -365,13 +365,13 @@ public class JsonReader extends Reader {
             if (nt == '}' || nt == ']') {
                 return false;
             }
-            this.position--;
+            backChar(ch);
             return true;
         }
         if (ch == '}' || ch == ']') {
             return false;
         }
-        this.position--; // { [ 交由 readObjectB 或 readMapB 或 readArrayB 读取
+        backChar(ch); // { [ 交由 readObjectB 或 readMapB 或 readArrayB 读取
         return true;
     }