Primitive JSON object verification

collector/collector.pl

@@ -165,6 +165,7 @@ sub     getTransByHash
         'eth_getTransactionByHash',
         $hash
     );
+    die "Invalid object received:\n".Dumper($json) if not exists $json->{'number'};
     my  $max                    =   0;
     my  $rcpt                   =   undef;
     do {