Merge pull request #3168 from poanetwork/vb-token-bridge-accounnts-fix

Fix for accounts page with token-bridge supply

CHANGELOG.md

@@ -4,6 +4,7 @@
 - [#3157](https://github.com/poanetwork/blockscout/pull/3157) - Read methods of implementation on proxy contract
 
 ### Fixes
+- [#3168](https://github.com/poanetwork/blockscout/pull/3168) - Eliminate internal server error at /accounts page with token-bridge type of supply and inexistent bridge contracts
 
 ### Chore
 

apps/explorer/lib/explorer/chain/supply/token_bridge.ex

@@ -85,12 +85,6 @@ defmodule Explorer.Chain.Supply.TokenBridge do
       |> Enum.map(fn {key, _value} -> key end)
       |> List.first()
 
-    value =
-      case Reader.query_contract(address, abi, params) do
-        %{^method_name => {:ok, [result]}} -> result
-        _ -> 0
-      end
-
     type =
       abi
       |> Enum.at(0)
@@ -98,6 +92,19 @@ defmodule Explorer.Chain.Supply.TokenBridge do
       |> Enum.at(0)
       |> Map.get("type", "")
 
+    value =
+      case Reader.query_contract(address, abi, params) do
+        %{^method_name => {:ok, [result]}} ->
+          result
+
+        _ ->
+          case type do
+            "address" -> "0x0000000000000000000000000000000000000000"
+            "uint256" -> 0
+            _ -> 0
+          end
+      end
+
     case type do
       "address" ->
         "0x" <> Base.encode16(value)