diff --git a/src/TokensTracker/Trackers/NEP-11/Nep11Tracker.cs b/src/TokensTracker/Trackers/NEP-11/Nep11Tracker.cs
index 35a579eb7..513132163 100644
--- a/src/TokensTracker/Trackers/NEP-11/Nep11Tracker.cs
+++ b/src/TokensTracker/Trackers/NEP-11/Nep11Tracker.cs
@@ -93,7 +93,18 @@ public override void OnPersist(NeoSystem system, Block block, DataCache snapshot
                         Log($"{state.Hash} is not nft!", LogLevel.Warning);
                         continue;
                     }
-
+                    if (balanceMethod != null &&
+                        !(balanceMethod.Parameters[0].Type == ContractParameterType.Hash160 && balanceMethod.ReturnType == ContractParameterType.Integer))
+                    {
+                        Log($"{state.Hash} is not nft:balance1!", LogLevel.Warning);
+                        continue;
+                    }
+                    if (balanceMethod2 != null &&
+                        !(balanceMethod2.Parameters[0].Type == ContractParameterType.Hash160 && balanceMethod2.Parameters[1].Type == ContractParameterType.ByteArray && balanceMethod2.ReturnType == ContractParameterType.Integer))
+                    {
+                        Log($"{state.Hash} is not nft:balance2!", LogLevel.Warning);
+                        continue;
+                    }
                     var isDivisible = balanceMethod2 != null;
                     contracts[transferRecord.asset] = (isDivisible, state);
                 }