diff --git a/c/rce.h b/c/rce.h
index 7a0980c..116dc67 100644
--- a/c/rce.h
+++ b/c/rce.h
@@ -14,6 +14,7 @@ enum ErrorCode {
   ERROR_SCRIPT_TOO_LONG = -21,
   ERROR_OVERFLOWING = -51,
   ERROR_AMOUNT = -52,
+  ERROR_EMPTY_XUDT = -53,
 
   // error code is starting from 40, to avoid conflict with
   // common error code in other scripts.
diff --git a/c/simple_udt.c b/c/simple_udt.c
index aa4c48b..ab9bfe3 100644
--- a/c/simple_udt.c
+++ b/c/simple_udt.c
@@ -34,6 +34,7 @@
 #define ERROR_SCRIPT_TOO_LONG -21
 #define ERROR_OVERFLOWING -51
 #define ERROR_AMOUNT -52
+#define ERROR_EMPTY_SUDT -53
 
 // We will leverage gcc's 128-bit integer extension here for number crunching.
 typedef unsigned __int128 uint128_t;
@@ -179,6 +180,10 @@ int main() {
     if (len < 16) {
       return ERROR_ENCODING;
     }
+    // disallow sudt cells with zero amount
+    if (current_amount == 0) {
+      return ERROR_EMPTY_SUDT;
+    }
     output_amount += current_amount;
     // Like any serious smart contract out there, we will need to check for
     // overflows.
diff --git a/c/xudt_rce.c b/c/xudt_rce.c
index b1c0110..3aa319b 100644
--- a/c/xudt_rce.c
+++ b/c/xudt_rce.c
@@ -586,6 +586,10 @@ int simple_udt(int owner_mode) {
     if (len < 16) {
       return ERROR_ENCODING;
     }
+    // disallow sudt cells with zero amount
+    if (current_amount == 0) {
+      return ERROR_EMPTY_XUDT;
+    }
     output_amount += current_amount;
     // Like any serious smart contract out there, we will need to check for
     // overflows.