fix: issue 543

Author: Wodann

packages/hardhat-core/src/internal/hardhat-network/provider/provider.ts

@@ -354,7 +354,13 @@ export class EdrProviderWrapper
     const responseObject: Response = await this._provider.handleRequest(
       stringifiedArgs
     );
-    const response = JSON.parse(responseObject.json);
+
+    let response;
+    if (typeof responseObject.data === "string") {
+      response = JSON.parse(responseObject.data);
+    } else {
+      response = responseObject.data;
+    }
 
     const needsTraces =
       this._node._vm.evm.events.eventNames().length > 0 ||

packages/hardhat-core/src/internal/hardhat-network/provider/vm/minimal-vm.ts

@@ -82,7 +82,12 @@ export function getMinimalEthereumJsVm(
           })
         );
 
-        const response = JSON.parse(responseObject.json);
+        let response;
+        if (typeof responseObject.data === "string") {
+          response = JSON.parse(responseObject.data);
+        } else {
+          response = responseObject.data;
+        }
 
         return Buffer.from(response.result.slice(2), "hex");
       },