diff --git a/src/common/src/ttypes.c b/src/common/src/ttypes.c
index 6fa27a029bfd5356cca3e34dffe8d3018ade9fd8..34dda32401b604450b3179cf0f344f53b6e2cb51 100644
--- a/src/common/src/ttypes.c
+++ b/src/common/src/ttypes.c
@@ -632,7 +632,15 @@ int32_t tStrToInteger(const char* z, int16_t type, int32_t n, int64_t* value, bo
   }
 
   // the string may be overflow according to errno
-  *value = issigned? strtoll(z, &endPtr, radix):strtoull(z, &endPtr, radix);
+  if (!issigned) {
+    const char *p = z;
+    while(*p != 0 && *p == ' ') p++;   
+    if (*p != 0 && *p == '-') { return -1;}
+
+    *value = strtoull(z, &endPtr, radix);
+  } else {
+    *value = strtoll(z, &endPtr, radix);
+  }
 
   // not a valid integer number, return error
   if (endPtr - z != n || errno == ERANGE) {
diff --git a/tests/script/general/field/bigint.sim b/tests/script/general/field/bigint.sim
index 3bb120c6410a2ea2e9c671bb4aca56fc8014124f..9736ac121fac21a443b2c740b27cede465bc460f 100644
--- a/tests/script/general/field/bigint.sim
+++ b/tests/script/general/field/bigint.sim
@@ -32,6 +32,9 @@ while $i < 5
     $ms = $x . m 
     sql insert into $tb values (now + $ms , 0 ) 
     $x = $x + 1
+    sql_error insert into $tb values (now + $ms , -10) 
+    sql_error insert into $tb values (now + $ms ,        -1000) 
+    sql_error insert into $tb values (now + $ms ,        -10000000) 
   endw  
   $i = $i + 1
 endw 
@@ -159,4 +162,4 @@ if $rows != 0 then
   return -1
 endi
 
-system sh/exec.sh -n dnode1 -s stop -x SIGINT
\ No newline at end of file
+system sh/exec.sh -n dnode1 -s stop -x SIGINT