diff --git a/src/org/redkale/convert/json/JsonReader.java b/src/org/redkale/convert/json/JsonReader.java
index b2ab6643e..0b0976a9d 100644
--- a/src/org/redkale/convert/json/JsonReader.java
+++ b/src/org/redkale/convert/json/JsonReader.java
@@ -476,16 +476,10 @@ public class JsonReader extends Reader {
             }
         }
         if (expected != '"' && expected != '\'') {
-            if (expected == 'n' && text0.length > currpos + 3 && (text0[1 + currpos] == 'u' && text0[2 + currpos] == 'l' && text0[3 + currpos] == 'l')) {
-                if (text0[++currpos] == 'u' && text0[++currpos] == 'l' && text0[++currpos] == 'l') {
-                    this.position = currpos;
-                    if (text0.length > currpos + 4) {
-                        char ch = text0[currpos + 1];
-                        if (ch == ',' || ch <= ' ' || ch == '}' || ch == ']' || ch == ':') return null;
-                    } else {
-                        return null;
-                    }
-                }
+            if (expected == 'n' && ((text0.length == currpos + 4 && (text0[1 + currpos] == 'u' && text0[2 + currpos] == 'l' && text0[3 + currpos] == 'l'))
+                || (text0.length > currpos + 4 && (text0[1 + currpos] == 'u' && text0[2 + currpos] == 'l' && text0[3 + currpos] == 'l')
+                && (text0[4 + currpos] == ',' || text0[4 + currpos] <= ' ' || text0[4 + currpos] == '}' || text0[4 + currpos] == ']' || text0[4 + currpos] == ':')))) {
+                return null;
             } else {
                 final int start = currpos;
                 for (;;) {
@@ -498,8 +492,8 @@ public class JsonReader extends Reader {
                 this.position = currpos - 1;
                 return new String(text0, start, currpos - start);
             }
-            this.position = currpos;
-            throw new ConvertException("expected a ':' after a key but '" + text0[position] + "' (position = " + position + ") in (" + new String(this.text) + ")");
+            //this.position = currpos;
+            //throw new ConvertException("expected a ':' after a key but '" + text0[position] + "' (position = " + position + ") in (" + new String(this.text) + ")");
         }
         final int start = ++currpos;
         for (;;) {